Drop support for CPython 3.8

Closes #910

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9, '3.10', 3.11, 3.12, 3.13, 3.14, pypy3.10-nightly]
+        python-version: [3.9, '3.10', 3.11, 3.12, 3.13, 3.14, pypy3.10-nightly]
     env:
       PYTEST_ADDOPTS: -n auto
     steps:

README.rst

@@ -113,8 +113,8 @@ Release history:
 1. Download & installation
 --------------------------
 
-Mpmath requires Python 3.8 or later versions.  It has been tested with CPython
-3.8 through 3.14 and for PyPy 3.10.
+Mpmath requires Python 3.9 or later versions.  It has been tested with CPython
+3.9 through 3.14 and for PyPy 3.10.
 
 The latest release of mpmath can be downloaded from the mpmath
 website and from https://github.com/mpmath/mpmath/releases

docs/setup.rst

@@ -1,7 +1,7 @@
 Setting up mpmath
 =================
 
-Mpmath requires at least Python 3.8.  It has been tested with CPython 3.8
+Mpmath requires at least Python 3.9.  It has been tested with CPython 3.9
 through 3.14 and for PyPy 3.10
 
 Download and installation

mpmath/libmp/libintmath.py

@@ -271,18 +271,10 @@ else:
     _gcd2 = math.gcd
 
 
-if sys.version_info >= (3, 9) and BACKEND == 'python':
+if BACKEND == 'python':
     gcd = math.gcd
 elif BACKEND == 'gmpy':
     gcd = gmpy.gcd
-else:
-    def gcd(*args):
-        res = MPZ_ZERO
-        for a in args:
-            a = MPZ(a)
-            if res != MPZ_ONE:
-                res = _gcd2(res, a)
-        return res
 
 
 @lru_cache(maxsize=250)

mpmath/tests/test_format.py

@@ -477,8 +477,6 @@ def test_mpf_floats_bulk(fmt, x):
     if not x and math.copysign(1, x) == -1:
         return  # skip negative zero
     spec = read_format_spec(fmt)
-    if sys.version_info < (3, 9) and spec['type'] in ('g', 'G'):
-        pytest.skip("CPython has incompatible g/G formatting in 3.8 and 3.9+")
     if not spec['type'] and spec['precision'] < 0 and math.isfinite(x):
         # The mpmath could choose a different decimal
         # representative (wrt CPython) for same binary
@@ -500,8 +498,6 @@ def test_mpc_complexes(fmt, z):
             or (not z.imag and math.copysign(1, z.imag) == -1)):
         return  # skip negative zero
     spec = read_format_spec(fmt)
-    if sys.version_info < (3, 9) and spec['type'] in ('g', 'G'):
-        pytest.skip("CPython has incompatible g/G formatting in 3.8 and 3.9+")
     if spec['precision'] < 0 and any(math.isfinite(_) for _ in [z.real, z.imag]):
         # The mpmath could choose a different decimal
         # representative (wrt CPython) for same binary

mpmath/tests/test_matrices.py

@@ -244,9 +244,6 @@ def test_matrix_numpy():
     assert matrix(l) == matrix(a)
     assert (numpy.array(matrix(l)) == numpy.array(matrix(l).tolist(),
                                                   dtype=object)).all()
-
-    if sys.version_info < (3, 9):
-        pytest.skip("latest numpy dropped support for CPython 3.8")
     if numpy.__version__ >= '2':
         pytest.raises(ValueError, lambda: numpy.array(matrix(l), copy=False))
 

pyproject.toml

@@ -12,7 +12,6 @@ classifiers = ['License :: OSI Approved :: BSD License',
                'Programming Language :: Python',
                'Programming Language :: Python :: 3',
                'Programming Language :: Python :: 3 :: Only',
-               'Programming Language :: Python :: 3.8',
                'Programming Language :: Python :: 3.9',
                'Programming Language :: Python :: 3.10',
                'Programming Language :: Python :: 3.11',
@@ -22,7 +21,7 @@ classifiers = ['License :: OSI Approved :: BSD License',
                'Programming Language :: Python :: Implementation :: CPython',
                'Programming Language :: Python :: Implementation :: PyPy']
 dynamic = ['version']
-requires-python = '>=3.8'
+requires-python = '>=3.9'
 [project.readme]
 file = 'README.rst'
 content-type = 'text/x-rst'