MAINT drop support for python 3.6/3.7 (#130)

.azure_pipeline.yml

@@ -27,15 +27,15 @@ stages:
           VERSION_PYTHON: '*'
           PACKAGER: 'conda-forge'
           BLAS: 'mkl'
-        py39_conda_forge_openblas:
-          VERSION_PYTHON: '3.9'
+        py310_conda_forge_openblas:
+          VERSION_PYTHON: '3.10'
           PACKAGER: 'conda-forge'
           BLAS: 'openblas'
-        py37_conda:
-          VERSION_PYTHON: '3.7'
+        py39_conda:
+          VERSION_PYTHON: '3.9'
           PACKAGER: 'conda'
-        py36_pip:
-          VERSION_PYTHON: '3.6'
+        py38_pip:
+          VERSION_PYTHON: '3.8'
           PACKAGER: 'pip'
 
 
@@ -52,16 +52,16 @@ stages:
           VERSION_PYTHON: '3.8'
           CC_OUTER_LOOP: 'gcc'
           CC_INNER_LOOP: 'gcc'
-        py36_ubuntu_openblas_gcc_gcc:
+        py38_ubuntu_openblas_gcc_gcc:
           PACKAGER: 'ubuntu'
           APT_BLAS: 'libopenblas-base libopenblas-dev'
           VERSION_PYTHON: '3.8'
           CC_OUTER_LOOP: 'gcc'
           CC_INNER_LOOP: 'gcc'
-        # Linux + Python 3.7 and homogeneous runtime nesting.
-        py37_conda_openblas_clang_clang:
+        # Linux + Python 3.9 and homogeneous runtime nesting.
+        py39_conda_openblas_clang_clang:
           PACKAGER: 'conda'
-          VERSION_PYTHON: '3.7'
+          VERSION_PYTHON: '3.9'
           BLAS: 'openblas'
           CC_OUTER_LOOP: 'clang-10'
           CC_INNER_LOOP: 'clang-10'
@@ -137,16 +137,24 @@ stages:
   - template: continuous_integration/posix.yml
     parameters:
       name: macOS
-      vmImage: macOS-10.15
+      vmImage: macOS-11
       matrix:
         # MacOS environment with OpenMP installed through homebrew
-        py36_conda_homebrew_libomp:
+        py38_conda_homebrew_libomp:
           PACKAGER: 'conda'
-          VERSION_PYTHON: '3.6'
+          VERSION_PYTHON: '3.8'
           BLAS: 'openblas'
           CC_OUTER_LOOP: 'clang'
           CC_INNER_LOOP: 'clang'
           INSTALL_LIBOMP: 'homebrew'
+        # MacOS env with OpenBLAS and OpenMP installed through conda-forge compilers
+        py39_conda_forge_clang_openblas:
+          PACKAGER: 'conda-forge'
+          VERSION_PYTHON: '*'
+          BLAS: 'openblas'
+          CC_OUTER_LOOP: 'clang'
+          CC_INNER_LOOP: 'clang'
+          INSTALL_LIBOMP: 'conda-forge'
         # MacOS environment with OpenMP installed through conda-forge compilers
         pylatest_conda_forge_clang:
           PACKAGER: 'conda-forge'

CHANGES.md

@@ -1,3 +1,8 @@
+3.2.0 (TBD)
+===========
+
+- Dropped support for Python 3.6 and 3.7.
+
 3.1.0 (2022-01-31)
 ==================
 

README.md

@@ -195,7 +195,8 @@ decorators are accessible through their `wrap` method:
 ### Sequential BLAS within OpenMP parallel region
 
 When one wants to have sequential BLAS calls within an OpenMP parallel region, it's
-safer to set `limits="sequential_blas_under_openmp"` since setting `limits=1` and `user_api="blas"` might not lead to the expected behavior in some configurations
+safer to set `limits="sequential_blas_under_openmp"` since setting `limits=1` and
+`user_api="blas"` might not lead to the expected behavior in some configurations
 (e.g. OpenBLAS with the OpenMP threading layer
 https://github.com/xianyi/OpenBLAS/issues/2985).
 

pyproject.toml

@@ -8,20 +8,19 @@ author = "Thomas Moreau"
 author-email = "thomas.moreau.2010@gmail.com"
 home-page = "https://github.com/joblib/threadpoolctl"
 description-file = "README.md"
-requires-python = ">=3.6"
+requires-python = ">=3.8"
 license = "BSD-3-Clause"
 classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: BSD License",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
     "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
 [tool.black]
 line-length = 88
-target_version = ['py36', 'py37', 'py38', 'py39']
-experimental_string_processing = true
+target_version = ['py38', 'py39', 'py310']
+preview = true

tests/test_threadpoolctl.py

@@ -460,7 +460,7 @@ def test_nested_prange_blas(nthreads_outer):
 
 # the method `get_original_num_threads` raises a UserWarning due to different
 # num_threads from libraries with the same `user_api`. It will be raised only
-# in the CI job with 2 openblas (py37_pip_openblas_gcc_clang). It is expected
+# in the CI job with 2 openblas (py38_pip_openblas_gcc_clang). It is expected
 # so we can safely filter it.
 @pytest.mark.filterwarnings("ignore::UserWarning")
 @pytest.mark.parametrize("limit", [1, None])

threadpoolctl.py

@@ -40,8 +40,8 @@
 
 # Structure to cast the info on dynamically loaded library. See
 # https://linux.die.net/man/3/dl_iterate_phdr for more details.
-_SYSTEM_UINT = ctypes.c_uint64 if sys.maxsize > 2 ** 32 else ctypes.c_uint32
-_SYSTEM_UINT_HALF = ctypes.c_uint32 if sys.maxsize > 2 ** 32 else ctypes.c_uint16
+_SYSTEM_UINT = ctypes.c_uint64 if sys.maxsize > 2**32 else ctypes.c_uint32
+_SYSTEM_UINT_HALF = ctypes.c_uint32 if sys.maxsize > 2**32 else ctypes.c_uint16
 
 
 class _dl_phdr_info(ctypes.Structure):
@@ -768,6 +768,12 @@ def _get_libc(cls):
         if libc is None:
             libc_name = find_library("c")
             if libc_name is None:  # pragma: no cover
+                warnings.warn(
+                    "libc not found. The ctypes module in Python "
+                    f"{sys.version_info.major}.{sys.version_info.minor} is maybe too "
+                    "old for this OS.",
+                    RuntimeWarning,
+                )
                 return None
             libc = ctypes.CDLL(libc_name, mode=_RTLD_NOLOAD)
             cls._system_libraries["libc"] = libc