Jhonathan Abreu
962fcd6b58
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* Add interpreters for Python ModuleNotFoundError and multiple inheritance TypeError * Recommend AlgorithmImports for missing C# namespaces, clr.AddReference only for local custom libraries * Advise against importing .NET assemblies from Python algorithms, recommending equivalent Python packages * Add the .NET assembly advice only when the missing module name is camel cased
84 lines
3.5 KiB
C#
84 lines
3.5 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Linq;
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using System.Text.RegularExpressions;
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using Python.Runtime;
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using QuantConnect.Util;
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namespace QuantConnect.Exceptions
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{
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/// <summary>
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/// Interprets Python ModuleNotFoundError exceptions
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/// </summary>
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public class ModuleNotFoundPythonExceptionInterpreter : PythonExceptionInterpreter
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{
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private static readonly Regex _camelCasedNameRegex = new Regex(@"^[A-Z][a-zA-Z0-9]*(\.[A-Z][a-zA-Z0-9]*)*$", RegexOptions.Compiled);
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/// <summary>
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/// Determines the order that an instance of this class should be called
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/// </summary>
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public override int Order => 0;
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/// <summary>
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/// Determines if this interpreter should be applied to the specified exception.
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/// </summary>
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/// <param name="exception">The exception to check</param>
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/// <returns>True if the exception can be interpreted, false otherwise</returns>
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public override bool CanInterpret(Exception exception)
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{
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var pythonException = exception as PythonException;
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if (pythonException == null)
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{
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return false;
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}
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using (Py.GIL())
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{
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return base.CanInterpret(exception) &&
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pythonException.Type.Name.Equals("ModuleNotFoundError", StringComparison.InvariantCultureIgnoreCase);
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}
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}
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/// <summary>
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/// Interprets the specified exception into a new exception
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/// </summary>
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/// <param name="exception">The exception to be interpreted</param>
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/// <param name="innerInterpreter">An interpreter that should be applied to the inner exception.</param>
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/// <returns>The interpreted exception</returns>
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public override Exception Interpret(Exception exception, IExceptionInterpreter innerInterpreter)
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{
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var pe = (PythonException)exception;
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var moduleName = pe.Message.GetStringBetweenChars('\'', '\'');
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var message = Messages.ModuleNotFoundPythonExceptionInterpreter.ModuleNotFound(moduleName, IsCamelCased(moduleName));
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message += PythonUtil.PythonExceptionStackParser(pe.StackTrace);
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return new Exception(message, pe);
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}
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/// <summary>
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/// Determines whether the module name follows .NET namespace casing (e.g. "QuantConnect.Indicators"):
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/// every dot-separated segment starts with an uppercase letter and the name contains at least one
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/// lowercase letter, so all-uppercase Python packages like "PIL" are not treated as assemblies.
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/// </summary>
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private static bool IsCamelCased(string moduleName)
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{
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return _camelCasedNameRegex.IsMatch(moduleName) && moduleName.Any(char.IsLower);
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}
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}
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}
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