quantconnect--lean/Algorithm/QCAlgorithm.Python.cs

/*
 * QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
 * Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/

using QuantConnect.Data;
using QuantConnect.Data.Consolidators;
using QuantConnect.Data.Market;
using QuantConnect.Indicators;
using System;
using QuantConnect.Securities;
using NodaTime;
using System.Collections.Generic;
using QuantConnect.Python;
using Python.Runtime;
using QuantConnect.Data.UniverseSelection;
using QuantConnect.Data.Fundamental;
using System.Linq;
using QuantConnect.Brokerages;
using QuantConnect.Scheduling;
using QuantConnect.Util;

namespace QuantConnect.Algorithm
{
    public partial class QCAlgorithm
    {
        private readonly Dictionary<IntPtr, PythonIndicator> _pythonIndicators = new Dictionary<IntPtr, PythonIndicator>();

        /// <summary>
        /// PandasConverter for this Algorithm
        /// </summary>
        public PandasConverter PandasConverter { get; private set; }

        /// <summary>
        /// Sets pandas converter
        /// </summary>
        public void SetPandasConverter()
        {
            PandasConverter = new PandasConverter();
        }

        /// <summary>
        /// AddData a new user defined data source, requiring only the minimum config options.
        /// The data is added with a default time zone of NewYork (Eastern Daylight Savings Time).
        /// This method is meant for custom data types that require a ticker, but have no underlying Symbol.
        /// Examples of data sources that meet this criteria are U.S. Treasury Yield Curve Rates and Trading Economics data
        /// </summary>
        /// <param name="type">Data source type</param>
        /// <param name="ticker">Key/Ticker for data</param>
        /// <param name="resolution">Resolution of the data</param>
        /// <returns>The new <see cref="Security"/></returns>
        public Security AddData(PyObject type, string ticker, Resolution? resolution = null)
        {
            return AddData(type, ticker, resolution, null, false, 1m);
        }

        /// <summary>
        /// AddData a new user defined data source, requiring only the minimum config options.
        /// The data is added with a default time zone of NewYork (Eastern Daylight Savings Time).
        /// This adds a Symbol to the `Underlying` property in the custom data Symbol object.
        /// Use this method when adding custom data with a ticker from the past, such as "AOL"
        /// before it became "TWX", or if you need to filter using custom data and place trades on the
        /// Symbol associated with the custom data.
        /// </summary>
        /// <param name="type">Data source type</param>
        /// <param name="underlying">The underlying symbol for the custom data</param>
        /// <param name="resolution">Resolution of the data</param>
        /// <returns>The new <see cref="Security"/></returns>
        /// <remarks>
        /// We include three optional unused object parameters so that pythonnet chooses the intended method
        /// correctly. Previously, calling the overloaded method that accepts a string would instead call this method.
        /// Adding the three unused parameters makes it choose the correct method when using a string or Symbol. This is
        /// due to pythonnet's method precedence, as viewable here: https://github.com/QuantConnect/pythonnet/blob/9e29755c54e6008cb016e3dd9d75fbd8cd19fcf7/src/runtime/methodbinder.cs#L215
        /// </remarks>
        public Security AddData(PyObject type, Symbol underlying, Resolution? resolution = null)
        {
            return AddData(type, underlying, resolution, null, false, 1m);
        }

        /// <summary>
        /// AddData a new user defined data source, requiring only the minimum config options.
        /// This method is meant for custom data types that require a ticker, but have no underlying Symbol.
        /// Examples of data sources that meet this criteria are U.S. Treasury Yield Curve Rates and Trading Economics data
        /// </summary>
        /// <param name="type">Data source type</param>
        /// <param name="ticker">Key/Ticker for data</param>
        /// <param name="resolution">Resolution of the Data Required</param>
        /// <param name="timeZone">Specifies the time zone of the raw data</param>
        /// <param name="fillDataForward">When no data available on a tradebar, return the last data that was generated</param>
        /// <param name="leverage">Custom leverage per security</param>
        /// <returns>The new <see cref="Security"/></returns>
        public Security AddData(PyObject type, string ticker, Resolution? resolution, DateTimeZone timeZone, bool fillDataForward = false, decimal leverage = 1.0m)
        {
            return AddData(type.CreateType(), ticker, resolution, timeZone, fillDataForward, leverage);
        }

        /// <summary>
        /// AddData a new user defined data source, requiring only the minimum config options.
        /// This adds a Symbol to the `Underlying` property in the custom data Symbol object.
        /// Use this method when adding custom data with a ticker from the past, such as "AOL"
        /// before it became "TWX", or if you need to filter using custom data and place trades on the
        /// Symbol associated with the custom data.
        /// </summary>
        /// <param name="type">Data source type</param>
        /// <param name="underlying">The underlying symbol for the custom data</param>
        /// <param name="resolution">Resolution of the Data Required</param>
        /// <param name="timeZone">Specifies the time zone of the raw data</param>
        /// <param name="fillDataForward">When no data available on a tradebar, return the last data that was generated</param>
        /// <param name="leverage">Custom leverage per security</param>
        /// <returns>The new <see cref="Security"/></returns>
        /// <remarks>
        /// We include three optional unused object parameters so that pythonnet chooses the intended method
        /// correctly. Previously, calling the overloaded method that accepts a string would instead call this method.
        /// Adding the three unused parameters makes it choose the correct method when using a string or Symbol. This is
        /// due to pythonnet's method precedence, as viewable here: https://github.com/QuantConnect/pythonnet/blob/9e29755c54e6008cb016e3dd9d75fbd8cd19fcf7/src/runtime/methodbinder.cs#L215
        /// </remarks>
        public Security AddData(PyObject type, Symbol underlying, Resolution? resolution, DateTimeZone timeZone, bool fillDataForward = false, decimal leverage = 1.0m)
        {
            return AddData(type.CreateType(), underlying, resolution, timeZone, fillDataForward, leverage);
        }

        /// <summary>
        /// AddData a new user defined data source, requiring only the minimum config options.
        /// This method is meant for custom data types that require a ticker, but have no underlying Symbol.
        /// Examples of data sources that meet this criteria are U.S. Treasury Yield Curve Rates and Trading Economics data
        /// </summary>
        /// <param name="dataType">Data source type</param>
        /// <param name="ticker">Key/Ticker for data</param>
        /// <param name="resolution">Resolution of the Data Required</param>
        /// <param name="timeZone">Specifies the time zone of the raw data</param>
        /// <param name="fillDataForward">When no data available on a tradebar, return the last data that was generated</param>
        /// <param name="leverage">Custom leverage per security</param>
        /// <returns>The new <see cref="Security"/></returns>
        public Security AddData(Type dataType, string ticker, Resolution? resolution, DateTimeZone timeZone, bool fillDataForward = false, decimal leverage = 1.0m)
        {
            // NOTE: Invoking methods on BaseData w/out setting the symbol may provide unexpected behavior
            var baseInstance = dataType.GetBaseDataInstance();
            if (!baseInstance.RequiresMapping())
            {
                var symbol = new Symbol(
                    SecurityIdentifier.GenerateBase(dataType, ticker, Market.USA, baseInstance.RequiresMapping()),
                    ticker);
                return AddDataImpl(dataType, symbol, resolution, timeZone, fillDataForward, leverage);
            }
            // If we need a mappable ticker and we can't find one in the SymbolCache, throw
            Symbol underlying;
            if (!SymbolCache.TryGetSymbol(ticker, out underlying))
            {
                throw new InvalidOperationException($"The custom data type {dataType.Name} requires mapping, but the provided ticker is not in the cache. " +
                                                    $"Please add this custom data type using a Symbol or perform this call after " +
                                                    $"a Security has been added using AddEquity, AddForex, AddCfd, AddCrypto, AddFuture, AddOption or AddSecurity. " +
                                                    $"An example use case can be found in CustomDataAddDataRegressionAlgorithm");
            }

            return AddData(dataType, underlying, resolution, timeZone, fillDataForward, leverage);
        }

        /// <summary>
        /// AddData a new user defined data source, requiring only the minimum config options.
        /// This adds a Symbol to the `Underlying` property in the custom data Symbol object.
        /// Use this method when adding custom data with a ticker from the past, such as "AOL"
        /// before it became "TWX", or if you need to filter using custom data and place trades on the
        /// Symbol associated with the custom data.
        /// </summary>
        /// <param name="dataType">Data source type</param>
        /// <param name="underlying"></param>
        /// <param name="resolution">Resolution of the Data Required</param>
        /// <param name="timeZone">Specifies the time zone of the raw data</param>
        /// <param name="fillDataForward">When no data available on a tradebar, return the last data that was generated</param>
        /// <param name="leverage">Custom leverage per security</param>
        /// <returns>The new <see cref="Security"/></returns>
        /// <remarks>
        /// We include three optional unused object parameters so that pythonnet chooses the intended method
        /// correctly. Previously, calling the overloaded method that accepts a string would instead call this method.
        /// Adding the three unused parameters makes it choose the correct method when using a string or Symbol. This is
        /// due to pythonnet's method precedence, as viewable here: https://github.com/QuantConnect/pythonnet/blob/9e29755c54e6008cb016e3dd9d75fbd8cd19fcf7/src/runtime/methodbinder.cs#L215
        /// </remarks>
        public Security AddData(Type dataType, Symbol underlying, Resolution? resolution = null, DateTimeZone timeZone = null, bool fillDataForward = false, decimal leverage = 1.0m)
        {
            var symbol = QuantConnect.Symbol.CreateBase(dataType, underlying, Market.USA);
            return AddDataImpl(dataType, symbol, resolution, timeZone, fillDataForward, leverage);
        }

        /// <summary>
        /// AddData a new user defined data source including symbol properties and exchange hours,
        /// all other vars are not required and will use defaults.
        /// This overload reflects the C# equivalent for custom properties and market hours
        /// </summary>
        /// <param name="type">Data source type</param>
        /// <param name="ticker">Key/Ticker for data</param>
        /// <param name="properties">The properties of this new custom data</param>
        /// <param name="exchangeHours">The Exchange hours of this symbol</param>
        /// <param name="resolution">Resolution of the Data Required</param>
        /// <param name="fillDataForward">When no data available on a tradebar, return the last data that was generated</param>
        /// <param name="leverage">Custom leverage per security</param>
        /// <returns>The new <see cref="Security"/></returns>
        public Security AddData(PyObject type, string ticker, SymbolProperties properties, SecurityExchangeHours exchangeHours, Resolution? resolution = null, bool fillDataForward = false, decimal leverage = 1.0m)
        {
            // Get the right key for storage of base type symbols
            var dataType = type.CreateType();
            var key = SecurityIdentifier.GenerateBaseSymbol(dataType, ticker);

            // Add entries to our Symbol Properties DB and MarketHours DB
            SetDatabaseEntries(key, properties, exchangeHours);

            // Then add the data
            return AddData(dataType, ticker, resolution, null, fillDataForward, leverage);
        }

        /// <summary>
        /// Creates and adds a new Future Option contract to the algorithm.
        /// </summary>
        /// <param name="futureSymbol">The Future canonical symbol (i.e. Symbol returned from <see cref="AddFuture"/>)</param>
        /// <param name="optionFilter">Filter to apply to option contracts loaded as part of the universe</param>
        /// <returns>The new Option security, containing a Future as its underlying.</returns>
        /// <exception cref="ArgumentException">The symbol provided is not canonical.</exception>
        public void AddFutureOption(Symbol futureSymbol, PyObject optionFilter)
        {
            Func<OptionFilterUniverse, OptionFilterUniverse> optionFilterUniverse;
            if (!optionFilter.TryConvertToDelegate(out optionFilterUniverse))
            {
                throw new ArgumentException("Option contract universe filter provided is not a function");
            }

            AddFutureOption(futureSymbol, optionFilterUniverse);
        }

        /// <summary>
        /// Adds the provided final Symbol with/without underlying set to the algorithm.
        /// This method is meant for custom data types that require a ticker, but have no underlying Symbol.
        /// Examples of data sources that meet this criteria are U.S. Treasury Yield Curve Rates and Trading Economics data
        /// </summary>
        /// <param name="dataType">Data source type</param>
        /// <param name="symbol">Final symbol that includes underlying (if any)</param>
        /// <param name="resolution">Resolution of the Data required</param>
        /// <param name="timeZone">Specifies the time zone of the raw data</param>
        /// <param name="fillDataForward">When no data available on a tradebar, return the last data that was generated</param>
        /// <param name="leverage">Custom leverage per security</param>
        /// <returns>The new <see cref="Security"/></returns>
        private Security AddDataImpl(Type dataType, Symbol symbol, Resolution? resolution, DateTimeZone timeZone, bool fillDataForward, decimal leverage)
        {
            var alias = symbol.ID.Symbol;
            SymbolCache.Set(alias, symbol);

            if (timeZone != null)
            {
                // user set time zone
                MarketHoursDatabase.SetEntryAlwaysOpen(Market.USA, alias, SecurityType.Base, timeZone);
            }

            //Add this new generic data as a tradeable security:
            var config = SubscriptionManager.SubscriptionDataConfigService.Add(
                dataType,
                symbol,
                resolution,
                fillDataForward,
                isCustomData: true,
                extendedMarketHours: true);
            var security = Securities.CreateSecurity(symbol, config, leverage, addToSymbolCache: false);

            return AddToUserDefinedUniverse(security, new List<SubscriptionDataConfig> { config });
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This is for coarse fundamental US Equity data and
        /// will be executed on day changes in the NewYork time zone (<see cref="TimeZones.NewYork"/>
        /// </summary>
        /// <param name="pyObject">Defines an initial coarse selection</param>
        public Universe AddUniverse(PyObject pyObject)
        {
            Func<IEnumerable<CoarseFundamental>, object> coarseFunc;
            Universe universe;

            // TODO: to be removed when https://github.com/QuantConnect/pythonnet/issues/62 is solved
            if (pyObject.TryConvert(out universe))
            {
                return AddUniverse(universe);
            }
            else if (pyObject.TryConvert(out universe, allowPythonDerivative: true))
            {
                return AddUniverse(new UniversePythonWrapper(pyObject));
            }
            else if (pyObject.TryConvertToDelegate(out coarseFunc))
            {
                return AddUniverse(coarseFunc.ConvertToUniverseSelectionSymbolDelegate());
            }
            else
            {
                using (Py.GIL())
                {
                    throw new ArgumentException($"QCAlgorithm.AddUniverse: {pyObject.Repr()} is not a valid argument.");
                }
            }
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This is for coarse and fine fundamental US Equity data and
        /// will be executed on day changes in the NewYork time zone (<see cref="TimeZones.NewYork"/>
        /// </summary>
        /// <param name="pyObject">Defines an initial coarse selection or a universe</param>
        /// <param name="pyfine">Defines a more detailed selection with access to more data</param>
        public Universe AddUniverse(PyObject pyObject, PyObject pyfine)
        {
            Func<IEnumerable<CoarseFundamental>, object> coarseFunc;
            Func<IEnumerable<FineFundamental>, object> fineFunc;
            Universe universe;

            if (pyObject.TryConvert(out universe) && pyfine.TryConvertToDelegate(out fineFunc))
            {
                return AddUniverse(universe, fineFunc.ConvertToUniverseSelectionSymbolDelegate());
            }
            else if (pyObject.TryConvertToDelegate(out coarseFunc) && pyfine.TryConvertToDelegate(out fineFunc))
            {
                return AddUniverse(coarseFunc.ConvertToUniverseSelectionSymbolDelegate(),
                    fineFunc.ConvertToUniverseSelectionSymbolDelegate());
            }
            else
            {
                using (Py.GIL())
                {
                    throw new ArgumentException($"QCAlgorithm.AddUniverse: {pyObject.Repr()} or {pyfine.Repr()} is not a valid argument.");
                }
            }
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This can be used to return a list of string
        /// symbols retrieved from anywhere and will loads those symbols under the US Equity market.
        /// </summary>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="resolution">The resolution this universe should be triggered on</param>
        /// <param name="pySelector">Function delegate that accepts a DateTime and returns a collection of string symbols</param>
        public Universe AddUniverse(string name, Resolution resolution, PyObject pySelector)
        {
            var selector = pySelector.ConvertToDelegate<Func<DateTime, object>>();
            return AddUniverse(name, resolution, selector.ConvertToUniverseSelectionStringDelegate());
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This can be used to return a list of string
        /// symbols retrieved from anywhere and will loads those symbols under the US Equity market.
        /// </summary>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="pySelector">Function delegate that accepts a DateTime and returns a collection of string symbols</param>
        public Universe AddUniverse(string name, PyObject pySelector)
        {
            var selector = pySelector.ConvertToDelegate<Func<DateTime, object>>();
            return AddUniverse(name, selector.ConvertToUniverseSelectionStringDelegate());
        }

        /// <summary>
        /// Creates a new user defined universe that will fire on the requested resolution during market hours.
        /// </summary>
        /// <param name="securityType">The security type of the universe</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="resolution">The resolution this universe should be triggered on</param>
        /// <param name="market">The market of the universe</param>
        /// <param name="universeSettings">The subscription settings used for securities added from this universe</param>
        /// <param name="pySelector">Function delegate that accepts a DateTime and returns a collection of string symbols</param>
        public Universe AddUniverse(SecurityType securityType, string name, Resolution resolution, string market, UniverseSettings universeSettings, PyObject pySelector)
        {
            var selector = pySelector.ConvertToDelegate<Func<DateTime, object>>();
            return AddUniverse(securityType, name, resolution, market, universeSettings, selector.ConvertToUniverseSelectionStringDelegate());
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This will use the default universe settings
        /// specified via the <see cref="UniverseSettings"/> property. This universe will use the defaults
        /// of SecurityType.Equity, Resolution.Daily, Market.USA, and UniverseSettings
        /// </summary>
        /// <param name="T">The data type</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="selector">Function delegate that performs selection on the universe data</param>
        public Universe AddUniverse(PyObject T, string name, PyObject selector)
        {
            return AddUniverse(T.CreateType(), SecurityType.Equity, name, Resolution.Daily, Market.USA, UniverseSettings, selector);
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This will use the default universe settings
        /// specified via the <see cref="UniverseSettings"/> property. This universe will use the defaults
        /// of SecurityType.Equity, Market.USA and UniverseSettings
        /// </summary>
        /// <param name="T">The data type</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="resolution">The epected resolution of the universe data</param>
        /// <param name="selector">Function delegate that performs selection on the universe data</param>
        public Universe AddUniverse(PyObject T, string name, Resolution resolution, PyObject selector)
        {
            return AddUniverse(T.CreateType(), SecurityType.Equity, name, resolution, Market.USA, UniverseSettings, selector);
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This will use the default universe settings
        /// specified via the <see cref="UniverseSettings"/> property. This universe will use the defaults
        /// of SecurityType.Equity, and Market.USA
        /// </summary>
        /// <param name="T">The data type</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="resolution">The epected resolution of the universe data</param>
        /// <param name="universeSettings">The settings used for securities added by this universe</param>
        /// <param name="selector">Function delegate that performs selection on the universe data</param>
        public Universe AddUniverse(PyObject T, string name, Resolution resolution, UniverseSettings universeSettings, PyObject selector)
        {
            return AddUniverse(T.CreateType(), SecurityType.Equity, name, resolution, Market.USA, universeSettings, selector);
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This will use the default universe settings
        /// specified via the <see cref="UniverseSettings"/> property. This universe will use the defaults
        /// of SecurityType.Equity, Resolution.Daily, and Market.USA
        /// </summary>
        /// <param name="T">The data type</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="universeSettings">The settings used for securities added by this universe</param>
        /// <param name="selector">Function delegate that performs selection on the universe data</param>
        public Universe AddUniverse(PyObject T, string name, UniverseSettings universeSettings, PyObject selector)
        {
            return AddUniverse(T.CreateType(), SecurityType.Equity, name, Resolution.Daily, Market.USA, universeSettings, selector);
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm. This will use the default universe settings
        /// specified via the <see cref="UniverseSettings"/> property.
        /// </summary>
        /// <param name="T">The data type</param>
        /// <param name="securityType">The security type the universe produces</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="resolution">The epected resolution of the universe data</param>
        /// <param name="market">The market for selected symbols</param>
        /// <param name="selector">Function delegate that performs selection on the universe data</param>
        public Universe AddUniverse(PyObject T, SecurityType securityType, string name, Resolution resolution, string market, PyObject selector)
        {
            return AddUniverse(T.CreateType(), securityType, name, resolution, market, UniverseSettings, selector);
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm
        /// </summary>
        /// <param name="T">The data type</param>
        /// <param name="securityType">The security type the universe produces</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="resolution">The epected resolution of the universe data</param>
        /// <param name="market">The market for selected symbols</param>
        /// <param name="universeSettings">The subscription settings to use for newly created subscriptions</param>
        /// <param name="selector">Function delegate that performs selection on the universe data</param>
        public Universe AddUniverse(PyObject T, SecurityType securityType, string name, Resolution resolution, string market, UniverseSettings universeSettings, PyObject selector)
        {
            return AddUniverse(T.CreateType(), securityType, name, resolution, market, universeSettings, selector);
        }

        /// <summary>
        /// Creates a new universe and adds it to the algorithm
        /// </summary>
        /// <param name="dataType">The data type</param>
        /// <param name="securityType">The security type the universe produces</param>
        /// <param name="name">A unique name for this universe</param>
        /// <param name="resolution">The epected resolution of the universe data</param>
        /// <param name="market">The market for selected symbols</param>
        /// <param name="universeSettings">The subscription settings to use for newly created subscriptions</param>
        /// <param name="pySelector">Function delegate that performs selection on the universe data</param>
        public Universe AddUniverse(Type dataType, SecurityType securityType, string name, Resolution resolution, string market, UniverseSettings universeSettings, PyObject pySelector)
        {
            var marketHoursDbEntry = MarketHoursDatabase.GetEntry(market, name, securityType);
            var dataTimeZone = marketHoursDbEntry.DataTimeZone;
            var exchangeTimeZone = marketHoursDbEntry.ExchangeHours.TimeZone;
            var symbol = QuantConnect.Symbol.Create(name, securityType, market, baseDataType: dataType);
            var config = new SubscriptionDataConfig(dataType, symbol, resolution, dataTimeZone, exchangeTimeZone, false, false, true, true, isFilteredSubscription: false);

            var selector = pySelector.ConvertToDelegate<Func<IEnumerable<IBaseData>, object>>();

            return AddUniverse(new FuncUniverse(config, universeSettings, baseDatas =>
            {
                var result = selector(baseDatas);
                return ReferenceEquals(result, Universe.Unchanged)
                    ? Universe.Unchanged : ((object[])result)
                        .Select(x => x is Symbol ? (Symbol)x : QuantConnect.Symbol.Create((string)x, securityType, market, baseDataType: dataType));
                }
            ));
        }

        /// <summary>
        /// Creates a new universe selection model and adds it to the algorithm. This universe selection model will chain to the security
        /// changes of a given <see cref="Universe"/> selection output and create a new <see cref="OptionChainUniverse"/> for each of them
        /// </summary>
        /// <param name="universe">The universe we want to chain an option universe selection model too</param>
        /// <param name="optionFilter">The option filter universe to use</param>
        public void AddUniverseOptions(PyObject universe, PyObject optionFilter)
        {
            Func<OptionFilterUniverse, OptionFilterUniverse> convertedOptionChain;
            Universe universeToChain;

            if (universe.TryConvert(out universeToChain) && optionFilter.TryConvertToDelegate(out convertedOptionChain))
            {
                AddUniverseOptions(universeToChain, convertedOptionChain);
            }
            else
            {
                using (Py.GIL())
                {
                    throw new ArgumentException($"QCAlgorithm.AddChainedEquityOptionUniverseSelectionModel: {universe.Repr()} or {optionFilter.Repr()} is not a valid argument.");
                }
            }
        }

        /// <summary>
        /// Registers the consolidator to receive automatic updates as well as configures the indicator to receive updates
        /// from the consolidator.
        /// </summary>
        /// <param name="symbol">The symbol to register against</param>
        /// <param name="indicator">The indicator to receive data from the consolidator</param>
        /// <param name="resolution">The resolution at which to send data to the indicator, null to use the same resolution as the subscription</param>
        /// <param name="selector">Selects a value from the BaseData send into the indicator, if null defaults to a cast (x => (T)x)</param>
        public void RegisterIndicator(Symbol symbol, PyObject indicator, Resolution? resolution = null, PyObject selector = null)
        {
            RegisterIndicator(symbol, indicator, ResolveConsolidator(symbol, resolution), selector);
        }

        /// <summary>
        /// Registers the consolidator to receive automatic updates as well as configures the indicator to receive updates
        /// from the consolidator.
        /// </summary>
        /// <param name="symbol">The symbol to register against</param>
        /// <param name="indicator">The indicator to receive data from the consolidator</param>
        /// <param name="resolution">The resolution at which to send data to the indicator, null to use the same resolution as the subscription</param>
        /// <param name="selector">Selects a value from the BaseData send into the indicator, if null defaults to a cast (x => (T)x)</param>
        public void RegisterIndicator(Symbol symbol, PyObject indicator, TimeSpan? resolution = null, PyObject selector = null)
        {
            RegisterIndicator(symbol, indicator, ResolveConsolidator(symbol, resolution), selector);
        }

        /// <summary>
        /// Registers the consolidator to receive automatic updates as well as configures the indicator to receive updates
        /// from the consolidator.
        /// </summary>
        /// <param name="symbol">The symbol to register against</param>
        /// <param name="indicator">The indicator to receive data from the consolidator</param>
        /// <param name="pyObject">The python object that it is trying to register with, could be consolidator or a timespan</param>
        /// <param name="selector">Selects a value from the BaseData send into the indicator, if null defaults to a cast (x => (T)x)</param>
        public void RegisterIndicator(Symbol symbol, PyObject indicator, PyObject pyObject, PyObject selector = null)
        {
            try
            {
                // First check if this is just a regular IDataConsolidator
                IDataConsolidator dataConsolidator;
                if (!pyObject.TryConvert(out dataConsolidator))
                {
                    // If not then try and wrap it as a custom Python consolidator
                    dataConsolidator = new DataConsolidatorPythonWrapper(pyObject);
                }
                RegisterIndicator(symbol, indicator, dataConsolidator, selector);
                return;
            }
            catch
            {

            }

            // Finally, since above didn't work, just try it as a timespan
            // Issue #4668 Fix
            using (Py.GIL())
            {
                try
                {
                    // tryConvert does not work for timespan
                    TimeSpan? timeSpan = pyObject.As<TimeSpan>();
                    if (timeSpan != default(TimeSpan))
                    {
                        RegisterIndicator(symbol, indicator, timeSpan, selector);
                    }
                }
                catch
                {
                    throw new ArgumentException("Invalid third argument, should be either a valid consolidator or timedelta object");
                }
            }
        }

        /// <summary>
        /// Registers the consolidator to receive automatic updates as well as configures the indicator to receive updates
        /// from the consolidator.
        /// </summary>
        /// <param name="symbol">The symbol to register against</param>
        /// <param name="indicator">The indicator to receive data from the consolidator</param>
        /// <param name="consolidator">The consolidator to receive raw subscription data</param>
        /// <param name="selector">Selects a value from the BaseData send into the indicator, if null defaults to a cast (x => (T)x)</param>
        public void RegisterIndicator(Symbol symbol, PyObject indicator, IDataConsolidator consolidator, PyObject selector = null)
        {
            // TODO: to be removed when https://github.com/QuantConnect/pythonnet/issues/62 is solved
            IndicatorBase<IndicatorDataPoint> indicatorDataPoint;
            IndicatorBase<IBaseDataBar> indicatorDataBar;
            IndicatorBase<TradeBar> indicatorTradeBar;

            if (indicator.TryConvert(out indicatorDataPoint))
            {
                RegisterIndicator(symbol, indicatorDataPoint, consolidator, selector?.ConvertToDelegate<Func<IBaseData, decimal>>());
                return;
            }
            else if (indicator.TryConvert(out indicatorDataBar))
            {
                RegisterIndicator(symbol, indicatorDataBar, consolidator, selector?.ConvertToDelegate<Func<IBaseData, IBaseDataBar>>());
                return;
            }
            else if (indicator.TryConvert(out indicatorTradeBar))
            {
                RegisterIndicator(symbol, indicatorTradeBar, consolidator, selector?.ConvertToDelegate<Func<IBaseData, TradeBar>>());
                return;
            }

            RegisterIndicator(symbol, WrapPythonIndicator(indicator), consolidator, selector?.ConvertToDelegate<Func<IBaseData, IBaseData>>());
        }

        /// <summary>
        /// Warms up a given indicator with historical data
        /// </summary>
        /// <param name="symbol">The symbol whose indicator we want</param>
        /// <param name="indicator">The indicator we want to warm up</param>
        /// <param name="resolution">The resolution</param>
        /// <param name="selector">Selects a value from the BaseData send into the indicator, if null defaults to a cast (x => (T)x)</param>
        public void WarmUpIndicator(Symbol symbol, PyObject indicator, Resolution? resolution = null, PyObject selector = null)
        {
            // TODO: to be removed when https://github.com/QuantConnect/pythonnet/issues/62 is solved
            IndicatorBase<IndicatorDataPoint> indicatorDataPoint;
            IndicatorBase<IBaseDataBar> indicatorDataBar;
            IndicatorBase<TradeBar> indicatorTradeBar;

            if (indicator.TryConvert(out indicatorDataPoint))
            {
                WarmUpIndicator(symbol, indicatorDataPoint, resolution, selector?.ConvertToDelegate<Func<IBaseData, decimal>>());
                return;
            }
            else if (indicator.TryConvert(out indicatorDataBar))
            {
                WarmUpIndicator(symbol, indicatorDataBar, resolution, selector?.ConvertToDelegate<Func<IBaseData, IBaseDataBar>>());
                return;
            }
            else if (indicator.TryConvert(out indicatorTradeBar))
            {
                WarmUpIndicator(symbol, indicatorTradeBar, resolution, selector?.ConvertToDelegate<Func<IBaseData, TradeBar>>());
                return;
            }

            WarmUpIndicator(symbol, WrapPythonIndicator(indicator), resolution, selector?.ConvertToDelegate<Func<IBaseData, IBaseData>>());
        }

        /// <summary>
        /// Plot a chart using string series name, with value.
        /// </summary>
        /// <param name="series">Name of the plot series</param>
        /// <param name="pyObject">PyObject with the value to plot</param>
        /// <seealso cref="Plot(string,decimal)"/>
        public void Plot(string series, PyObject pyObject)
        {
            using (Py.GIL())
            {
                try
                {
                    var value = (((dynamic)pyObject).Current.Value as PyObject).GetAndDispose<decimal>();
                    Plot(series, value);
                }
                catch
                {
                    var pythonType = pyObject.GetPythonType().Repr();
                    throw new ArgumentException($"QCAlgorithm.Plot(): The last argument should be a QuantConnect Indicator object, {pythonType} was provided.");
                }
            }
        }

        /// <summary>
        /// Plots the value of each indicator on the chart
        /// </summary>
        /// <param name="chart">The chart's name</param>
        /// <param name="first">The first indicator to plot</param>
        /// <param name="second">The second indicator to plot</param>
        /// <param name="third">The third indicator to plot</param>
        /// <param name="fourth">The fourth indicator to plot</param>
        /// <seealso cref="Plot(string,string,decimal)"/>
        public void Plot(string chart, Indicator first, Indicator second = null, Indicator third = null, Indicator fourth = null)
        {
            Plot(chart, new[] { first, second, third, fourth }.Where(x => x != null).ToArray());
        }

        /// <summary>
        /// Plots the value of each indicator on the chart
        /// </summary>
        /// <param name="chart">The chart's name</param>
        /// <param name="first">The first indicator to plot</param>
        /// <param name="second">The second indicator to plot</param>
        /// <param name="third">The third indicator to plot</param>
        /// <param name="fourth">The fourth indicator to plot</param>
        /// <seealso cref="Plot(string,string,decimal)"/>
        public void Plot(string chart, BarIndicator first, BarIndicator second = null, BarIndicator third = null, BarIndicator fourth = null)
        {
            Plot(chart, new[] { first, second, third, fourth }.Where(x => x != null).ToArray());
        }

        /// <summary>
        /// Plots the value of each indicator on the chart
        /// </summary>
        /// <param name="chart">The chart's name</param>
        /// <param name="first">The first indicator to plot</param>
        /// <param name="second">The second indicator to plot</param>
        /// <param name="third">The third indicator to plot</param>
        /// <param name="fourth">The fourth indicator to plot</param>
        /// <seealso cref="Plot(string,string,decimal)"/>
        public void Plot(string chart, TradeBarIndicator first, TradeBarIndicator second = null, TradeBarIndicator third = null, TradeBarIndicator fourth = null)
        {
            Plot(chart, new[] { first, second, third, fourth }.Where(x => x != null).ToArray());
        }

        /// <summary>
        /// Automatically plots each indicator when a new value is available
        /// </summary>
        public void PlotIndicator(string chart, PyObject first, PyObject second = null, PyObject third = null, PyObject fourth = null)
        {
            var array = GetIndicatorArray(first, second, third, fourth);
            PlotIndicator(chart, array[0], array[1], array[2], array[3]);
        }

        /// <summary>
        /// Automatically plots each indicator when a new value is available
        /// </summary>
        public void PlotIndicator(string chart, bool waitForReady, PyObject first, PyObject second = null, PyObject third = null, PyObject fourth = null)
        {
            var array = GetIndicatorArray(first, second, third, fourth);
            PlotIndicator(chart, waitForReady, array[0], array[1], array[2], array[3]);
        }

        /// <summary>
        /// Creates a new FilteredIdentity indicator for the symbol The indicator will be automatically
        /// updated on the symbol's subscription resolution
        /// </summary>
        /// <param name="symbol">The symbol whose values we want as an indicator</param>
        /// <param name="selector">Selects a value from the BaseData, if null defaults to the .Value property (x => x.Value)</param>
        /// <param name="filter">Filters the IBaseData send into the indicator, if null defaults to true (x => true) which means no filter</param>
        /// <param name="fieldName">The name of the field being selected</param>
        /// <returns>A new FilteredIdentity indicator for the specified symbol and selector</returns>
        public FilteredIdentity FilteredIdentity(Symbol symbol, PyObject selector = null, PyObject filter = null, string fieldName = null)
        {
            var resolution = GetSubscription(symbol).Resolution;
            return FilteredIdentity(symbol, resolution, selector, filter, fieldName);
        }

        /// <summary>
        /// Creates a new FilteredIdentity indicator for the symbol The indicator will be automatically
        /// updated on the symbol's subscription resolution
        /// </summary>
        /// <param name="symbol">The symbol whose values we want as an indicator</param>
        /// <param name="resolution">The desired resolution of the data</param>
        /// <param name="selector">Selects a value from the BaseData, if null defaults to the .Value property (x => x.Value)</param>
        /// <param name="filter">Filters the IBaseData send into the indicator, if null defaults to true (x => true) which means no filter</param>
        /// <param name="fieldName">The name of the field being selected</param>
        /// <returns>A new FilteredIdentity indicator for the specified symbol and selector</returns>
        public FilteredIdentity FilteredIdentity(Symbol symbol, Resolution resolution, PyObject selector = null, PyObject filter = null, string fieldName = null)
        {
            var name = CreateIndicatorName(symbol, fieldName ?? "close", resolution);
            var pyselector = PythonUtil.ToFunc<IBaseData, IBaseDataBar>(selector);
            var pyfilter = PythonUtil.ToFunc<IBaseData, bool>(filter);
            var filteredIdentity = new FilteredIdentity(name, pyfilter);
            RegisterIndicator(symbol, filteredIdentity, resolution, pyselector);
            return filteredIdentity;
        }

        /// <summary>
        /// Creates a new FilteredIdentity indicator for the symbol The indicator will be automatically
        /// updated on the symbol's subscription resolution
        /// </summary>
        /// <param name="symbol">The symbol whose values we want as an indicator</param>
        /// <param name="resolution">The desired resolution of the data</param>
        /// <param name="selector">Selects a value from the BaseData, if null defaults to the .Value property (x => x.Value)</param>
        /// <param name="filter">Filters the IBaseData send into the indicator, if null defaults to true (x => true) which means no filter</param>
        /// <param name="fieldName">The name of the field being selected</param>
        /// <returns>A new FilteredIdentity indicator for the specified symbol and selector</returns>
        public FilteredIdentity FilteredIdentity(Symbol symbol, TimeSpan resolution, PyObject selector = null, PyObject filter = null, string fieldName = null)
        {
            var name = $"{symbol}({fieldName ?? "close"}_{resolution.ToStringInvariant(null)})";
            var pyselector = PythonUtil.ToFunc<IBaseData, IBaseDataBar>(selector);
            var pyfilter = PythonUtil.ToFunc<IBaseData, bool>(filter);
            var filteredIdentity = new FilteredIdentity(name, pyfilter);
            RegisterIndicator(symbol, filteredIdentity, ResolveConsolidator(symbol, resolution), pyselector);
            return filteredIdentity;
        }

        /// <summary>
        /// Gets the historical data for the specified symbol. The exact number of bars will be returned.
        /// The symbol must exist in the Securities collection.
        /// </summary>
        /// <param name="tickers">The symbols to retrieve historical data for</param>
        /// <param name="periods">The number of bars to request</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>A python dictionary with pandas DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject tickers, int periods, Resolution? resolution = null)
        {
            var symbols = tickers.ConvertToSymbolEnumerable();
            return PandasConverter.GetDataFrame(History(symbols, periods, resolution));
        }

        /// <summary>
        /// Gets the historical data for the specified symbols over the requested span.
        /// The symbols must exist in the Securities collection.
        /// </summary>
        /// <param name="tickers">The symbols to retrieve historical data for</param>
        /// <param name="span">The span over which to retrieve recent historical data</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>A python dictionary with pandas DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject tickers, TimeSpan span, Resolution? resolution = null)
        {
            var symbols = tickers.ConvertToSymbolEnumerable();
            return PandasConverter.GetDataFrame(History(symbols, span, resolution));
        }

        /// <summary>
        /// Gets the historical data for the specified symbol between the specified dates. The symbol must exist in the Securities collection.
        /// </summary>
        /// <param name="tickers">The symbols to retrieve historical data for</param>
        /// <param name="start">The start time in the algorithm's time zone</param>
        /// <param name="end">The end time in the algorithm's time zone</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>A python dictionary with pandas DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject tickers, DateTime start, DateTime end, Resolution? resolution = null)
        {
            var symbols = tickers.ConvertToSymbolEnumerable();
            return PandasConverter.GetDataFrame(History(symbols, start, end, resolution));
        }

        /// <summary>
        /// Gets the historical data for the specified symbols between the specified dates. The symbols must exist in the Securities collection.
        /// </summary>
        /// <param name="type">The data type of the symbols</param>
        /// <param name="tickers">The symbols to retrieve historical data for</param>
        /// <param name="start">The start time in the algorithm's time zone</param>
        /// <param name="end">The end time in the algorithm's time zone</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>pandas.DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject type, PyObject tickers, DateTime start, DateTime end, Resolution? resolution = null)
        {
            var symbols = tickers.ConvertToSymbolEnumerable();
            var requestedType = type.CreateType();

            var requests = symbols.Select(x =>
            {
                var security = Securities[x];
                var config = security.Subscriptions.OrderByDescending(s => s.Resolution)
                        .FirstOrDefault(s => s.Type.BaseType == requestedType.BaseType);
                if (config == null) return null;

                return _historyRequestFactory.CreateHistoryRequest(config, start, end, GetExchangeHours(x), resolution);
            });

            return PandasConverter.GetDataFrame(History(requests.Where(x => x != null)).Memoize());
        }

        /// <summary>
        /// Gets the historical data for the specified symbols. The exact number of bars will be returned for
        /// each symbol. This may result in some data start earlier/later than others due to when various
        /// exchanges are open. The symbols must exist in the Securities collection.
        /// </summary>
        /// <param name="type">The data type of the symbols</param>
        /// <param name="tickers">The symbols to retrieve historical data for</param>
        /// <param name="periods">The number of bars to request</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>pandas.DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject type, PyObject tickers, int periods, Resolution? resolution = null)
        {
            var symbols = tickers.ConvertToSymbolEnumerable();
            var requestedType = type.CreateType();

            var requests = symbols.Select(x =>
            {
                var security = Securities[x];
                var config = security.Subscriptions.OrderByDescending(s => s.Resolution)
                        .FirstOrDefault(s => s.Type.BaseType == requestedType.BaseType);
                if (config == null) return null;

                var res = GetResolution(x, resolution);
                var exchange = GetExchangeHours(x);
                var start = _historyRequestFactory.GetStartTimeAlgoTz(x, periods, res, exchange, config.DataTimeZone);
                return _historyRequestFactory.CreateHistoryRequest(config, start, Time, exchange, res);
            });

            return PandasConverter.GetDataFrame(History(requests.Where(x => x != null)).Memoize());
        }

        /// <summary>
        /// Gets the historical data for the specified symbols over the requested span.
        /// The symbols must exist in the Securities collection.
        /// </summary>
        /// <param name="type">The data type of the symbols</param>
        /// <param name="tickers">The symbols to retrieve historical data for</param>
        /// <param name="span">The span over which to retrieve recent historical data</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>pandas.DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject type, PyObject tickers, TimeSpan span, Resolution? resolution = null)
        {
            return History(type, tickers, Time - span, Time, resolution);
        }

        /// <summary>
        /// Gets the historical data for the specified symbols between the specified dates. The symbols must exist in the Securities collection.
        /// </summary>
        /// <param name="type">The data type of the symbols</param>
        /// <param name="symbol">The symbol to retrieve historical data for</param>
        /// <param name="start">The start time in the algorithm's time zone</param>
        /// <param name="end">The end time in the algorithm's time zone</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>pandas.DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject type, Symbol symbol, DateTime start, DateTime end, Resolution? resolution = null)
        {
            var security = Securities[symbol];
            // verify the types match
            var requestedType = type.CreateType();
            var config = security.Subscriptions.OrderByDescending(s => s.Resolution)
                .FirstOrDefault(s => s.Type.BaseType == requestedType.BaseType);
            if (config == null)
            {
                var actualType = security.Subscriptions.Select(x => x.Type.Name).DefaultIfEmpty("[None]").FirstOrDefault();
                throw new ArgumentException("The specified security is not of the requested type. Symbol: " + symbol.ToString() + " Requested Type: " + requestedType.Name + " Actual Type: " + actualType);
            }

            var request = _historyRequestFactory.CreateHistoryRequest(config, start, end, GetExchangeHours(symbol), resolution);
            return PandasConverter.GetDataFrame(History(request).Memoize());
        }

        /// <summary>
        /// Gets the historical data for the specified symbols. The exact number of bars will be returned for
        /// each symbol. This may result in some data start earlier/later than others due to when various
        /// exchanges are open. The symbols must exist in the Securities collection.
        /// </summary>
        /// <param name="type">The data type of the symbols</param>
        /// <param name="symbol">The symbol to retrieve historical data for</param>
        /// <param name="periods">The number of bars to request</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>pandas.DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject type, Symbol symbol, int periods, Resolution? resolution = null)
        {
            if (resolution == Resolution.Tick) throw new ArgumentException("History functions that accept a 'periods' parameter can not be used with Resolution.Tick");

            var res = GetResolution(symbol, resolution);
            var marketHours = GetMarketHours(symbol);
            var start = _historyRequestFactory.GetStartTimeAlgoTz(symbol, periods, res, marketHours.ExchangeHours, marketHours.DataTimeZone);
            return History(type, symbol, start, Time, resolution);
        }

        /// <summary>
        /// Gets the historical data for the specified symbols over the requested span.
        /// The symbols must exist in the Securities collection.
        /// </summary>
        /// <param name="type">The data type of the symbols</param>
        /// <param name="symbol">The symbol to retrieve historical data for</param>
        /// <param name="span">The span over which to retrieve recent historical data</param>
        /// <param name="resolution">The resolution to request</param>
        /// <returns>pandas.DataFrame containing the requested historical data</returns>
        public PyObject History(PyObject type, Symbol symbol, TimeSpan span, Resolution? resolution = null)
        {
            return History(type, symbol, Time - span, Time, resolution);
        }

        /// <summary>
        /// Sets the specified function as the benchmark, this function provides the value of
        /// the benchmark at each date/time requested
        /// </summary>
        /// <param name="benchmark">The benchmark producing function</param>
        public void SetBenchmark(PyObject benchmark)
        {
            using (Py.GIL())
            {
                var pyBenchmark = PythonUtil.ToFunc<DateTime, decimal>(benchmark);
                if (pyBenchmark != null)
                {
                    SetBenchmark(pyBenchmark);
                    return;
                }
                SetBenchmark((Symbol)benchmark.AsManagedObject(typeof(Symbol)));
            }
        }

        /// <summary>
        /// Sets the brokerage to emulate in backtesting or paper trading.
        /// This can be used to set a custom brokerage model.
        /// </summary>
        /// <param name="model">The brokerage model to use</param>
        public void SetBrokerageModel(PyObject model)
        {
            IBrokerageModel brokerageModel;
            if (!model.TryConvert(out brokerageModel))
            {
                brokerageModel = new BrokerageModelPythonWrapper(model);
            }

            SetBrokerageModel(brokerageModel);
        }

        /// <summary>
        /// Sets the security initializer function, used to initialize/configure securities after creation
        /// </summary>
        /// <param name="securityInitializer">The security initializer function or class</param>
        public void SetSecurityInitializer(PyObject securityInitializer)
        {
            var securityInitializer1 = PythonUtil.ToAction<Security>(securityInitializer);
            if (securityInitializer1 != null)
            {
                SetSecurityInitializer(securityInitializer1);
                return;
            }

            SetSecurityInitializer(new SecurityInitializerPythonWrapper(securityInitializer));
        }

        /// <summary>
        /// Downloads the requested resource as a <see cref="string"/>.
        /// The resource to download is specified as a <see cref="string"/> containing the URI.
        /// </summary>
        /// <param name="address">A string containing the URI to download</param>
        /// <param name="headers">Defines header values to add to the request</param>
        /// <returns>The requested resource as a <see cref="string"/></returns>
        public string Download(string address, PyObject headers) => Download(address, headers, null, null);

        /// <summary>
        /// Downloads the requested resource as a <see cref="string"/>.
        /// The resource to download is specified as a <see cref="string"/> containing the URI.
        /// </summary>
        /// <param name="address">A string containing the URI to download</param>
        /// <param name="headers">Defines header values to add to the request</param>
        /// <param name="userName">The user name associated with the credentials</param>
        /// <param name="password">The password for the user name associated with the credentials</param>
        /// <returns>The requested resource as a <see cref="string"/></returns>
        public string Download(string address, PyObject headers, string userName, string password)
        {
            var dict = new Dictionary<string, string>();

            if (headers != null)
            {
                using (Py.GIL())
                {
                    // In python algorithms, headers must be a python dictionary
                    // In order to convert it into a C# Dictionary
                    if (PyDict.IsDictType(headers))
                    {
                        foreach (PyObject pyKey in headers)
                        {
                            var key = (string)pyKey.AsManagedObject(typeof(string));
                            var value = (string)headers.GetItem(pyKey).AsManagedObject(typeof(string));
                            dict.Add(key, value);
                        }
                    }
                    else
                    {
                        throw new ArgumentException($"QCAlgorithm.Fetch(): Invalid argument. {headers.Repr()} is not a dict");
                    }
                }
            }
            return Download(address, dict, userName, password);
        }

        /// <summary>
        /// Send a debug message to the web console:
        /// </summary>
        /// <param name="message">Message to send to debug console</param>
        /// <seealso cref="Log(PyObject)"/>
        /// <seealso cref="Error(PyObject)"/>
        public void Debug(PyObject message)
        {
            Debug(message.ToSafeString());
        }

        /// <summary>
        /// Send a string error message to the Console.
        /// </summary>
        /// <param name="message">Message to display in errors grid</param>
        /// <seealso cref="Debug(PyObject)"/>
        /// <seealso cref="Log(PyObject)"/>
        public void Error(PyObject message)
        {
            Error(message.ToSafeString());
        }

        /// <summary>
        /// Added another method for logging if user guessed.
        /// </summary>
        /// <param name="message">String message to log.</param>
        /// <seealso cref="Debug(PyObject)"/>
        /// <seealso cref="Error(PyObject)"/>
        public void Log(PyObject message)
        {
            Log(message.ToSafeString());
        }

        /// <summary>
        /// Terminate the algorithm after processing the current event handler.
        /// </summary>
        /// <param name="message">Exit message to display on quitting</param>
        public void Quit(PyObject message)
        {
            Quit(message.ToSafeString());
        }

        /// <summary>
        /// Registers the <paramref name="handler"/> to receive consolidated data for the specified symbol
        /// </summary>
        /// <param name="symbol">The symbol who's data is to be consolidated</param>
        /// <param name="period">The consolidation period</param>
        /// <param name="handler">Data handler receives new consolidated data when generated</param>
        /// <returns>A new consolidator matching the requested parameters with the handler already registered</returns>
        public IDataConsolidator Consolidate(Symbol symbol, Resolution period, PyObject handler)
        {
            return Consolidate(symbol, period.ToTimeSpan(), null, handler);
        }

        /// <summary>
        /// Registers the <paramref name="handler"/> to receive consolidated data for the specified symbol
        /// </summary>
        /// <param name="symbol">The symbol who's data is to be consolidated</param>
        /// <param name="period">The consolidation period</param>
        /// <param name="tickType">The tick type of subscription used as data source for consolidator. Specify null to use first subscription found.</param>
        /// <param name="handler">Data handler receives new consolidated data when generated</param>
        /// <returns>A new consolidator matching the requested parameters with the handler already registered</returns>
        public IDataConsolidator Consolidate(Symbol symbol, Resolution period, TickType? tickType, PyObject handler)
        {
            return Consolidate(symbol, period.ToTimeSpan(), tickType, handler);
        }

        /// <summary>
        /// Registers the <paramref name="handler"/> to receive consolidated data for the specified symbol
        /// </summary>
        /// <param name="symbol">The symbol who's data is to be consolidated</param>
        /// <param name="period">The consolidation period</param>
        /// <param name="handler">Data handler receives new consolidated data when generated</param>
        /// <returns>A new consolidator matching the requested parameters with the handler already registered</returns>
        public IDataConsolidator Consolidate(Symbol symbol, TimeSpan period, PyObject handler)
        {
            return Consolidate(symbol, period, null, handler);
        }

        /// <summary>
        /// Registers the <paramref name="handler"/> to receive consolidated data for the specified symbol
        /// </summary>
        /// <param name="symbol">The symbol who's data is to be consolidated</param>
        /// <param name="period">The consolidation period</param>
        /// <param name="tickType">The tick type of subscription used as data source for consolidator. Specify null to use first subscription found.</param>
        /// <param name="handler">Data handler receives new consolidated data when generated</param>
        /// <returns>A new consolidator matching the requested parameters with the handler already registered</returns>
        public IDataConsolidator Consolidate(Symbol symbol, TimeSpan period, TickType? tickType, PyObject handler)
        {
            // resolve consolidator input subscription
            var type = GetSubscription(symbol, tickType).Type;

            if (type == typeof(TradeBar))
            {
                return Consolidate(symbol, period, tickType, handler.ConvertToDelegate<Action<TradeBar>>());
            }

            if (type == typeof(QuoteBar))
            {
                return Consolidate(symbol, period, tickType, handler.ConvertToDelegate<Action<QuoteBar>>());
            }

            return Consolidate(symbol, period, null, handler.ConvertToDelegate<Action<BaseData>>());
        }

        /// <summary>
        /// Registers the <paramref name="handler"/> to receive consolidated data for the specified symbol
        /// </summary>
        /// <param name="symbol">The symbol who's data is to be consolidated</param>
        /// <param name="calendar">The consolidation calendar</param>
        /// <param name="handler">Data handler receives new consolidated data when generated</param>
        /// <returns>A new consolidator matching the requested parameters with the handler already registered</returns>
        public IDataConsolidator Consolidate(Symbol symbol, Func<DateTime, CalendarInfo> calendar, PyObject handler)
        {
            return Consolidate(symbol, calendar, null, handler);
        }

        /// <summary>
        /// Schedules the provided training code to execute immediately
        /// </summary>
        /// <param name="trainingCode">The training code to be invoked</param>
        public ScheduledEvent Train(PyObject trainingCode)
        {
            return Schedule.TrainingNow(trainingCode);
        }

        /// <summary>
        /// Schedules the training code to run using the specified date and time rules
        /// </summary>
        /// <param name="dateRule">Specifies what dates the event should run</param>
        /// <param name="timeRule">Specifies the times on those dates the event should run</param>
        /// <param name="trainingCode">The training code to be invoked</param>
        public ScheduledEvent Train(IDateRule dateRule, ITimeRule timeRule, PyObject trainingCode)
        {
            return Schedule.Training(dateRule, timeRule, trainingCode);
        }

        /// <summary>
        /// Registers the <paramref name="handler"/> to receive consolidated data for the specified symbol
        /// </summary>
        /// <param name="symbol">The symbol who's data is to be consolidated</param>
        /// <param name="calendar">The consolidation calendar</param>
        /// <param name="tickType">The tick type of subscription used as data source for consolidator. Specify null to use first subscription found.</param>
        /// <param name="handler">Data handler receives new consolidated data when generated</param>
        /// <returns>A new consolidator matching the requested parameters with the handler already registered</returns>
        private IDataConsolidator Consolidate(Symbol symbol, Func<DateTime, CalendarInfo> calendar, TickType? tickType, PyObject handler)
        {
            // resolve consolidator input subscription
            var type = GetSubscription(symbol, tickType).Type;

            if (type == typeof(TradeBar))
            {
                return Consolidate(symbol, calendar, tickType, handler.ConvertToDelegate<Action<TradeBar>>());
            }

            if (type == typeof(QuoteBar))
            {
                return Consolidate(symbol, calendar, tickType, handler.ConvertToDelegate<Action<QuoteBar>>());
            }

            return Consolidate(symbol, calendar, tickType, handler.ConvertToDelegate<Action<BaseData>>());
        }

        /// <summary>
        /// Gets indicator base type
        /// </summary>
        /// <param name="type">Indicator type</param>
        /// <returns>Indicator base type</returns>
        private Type GetIndicatorBaseType(Type type)
        {
            if (type.BaseType == typeof(object))
            {
                return type;
            }
            return GetIndicatorBaseType(type.BaseType);
        }

        /// <summary>
        /// Converts the sequence of PyObject objects into an array of dynamic objects that represent indicators of the same type
        /// </summary>
        /// <returns>Array of dynamic objects with indicator</returns>
        private dynamic[] GetIndicatorArray(PyObject first, PyObject second = null, PyObject third = null, PyObject fourth = null)
        {
            using (Py.GIL())
            {
                var array = new[] {first, second, third, fourth}
                    .Select(
                        x =>
                        {
                            if (x == null) return null;

                            Type type;
                            return x.GetPythonType().TryConvert(out type)
                                ? x.AsManagedObject(type)
                                : WrapPythonIndicator(x);
                        }
                    ).ToArray();

                var types = array.Where(x => x != null).Select(x => GetIndicatorBaseType(x.GetType())).Distinct();

                if (types.Count() > 1)
                {
                    throw new Exception("QCAlgorithm.GetIndicatorArray(). All indicators must be of the same type: data point, bar or tradebar.");
                }

                return array;
            }
        }

        /// <summary>
        /// Wraps a custom python indicator and save its reference to _pythonIndicators dictionary
        /// </summary>
        /// <param name="pyObject">The python implementation of <see cref="IndicatorBase{IBaseDataBar}"/></param>
        /// <returns><see cref="PythonIndicator"/> that wraps the python implementation</returns>
        private PythonIndicator WrapPythonIndicator(PyObject pyObject)
        {
            PythonIndicator pythonIndicator;

            if (!_pythonIndicators.TryGetValue(pyObject.Handle, out pythonIndicator))
            {
                pyObject.TryConvert(out pythonIndicator);
                pythonIndicator?.SetIndicator(pyObject);

                if (pythonIndicator == null)
                {
                    pythonIndicator = new PythonIndicator(pyObject);
                }

                // Save to prevent future additions
                _pythonIndicators.Add(pyObject.Handle, pythonIndicator);
            }

            return pythonIndicator;
        }
    }
}