Added supported Python versions to package metadata

Details:

* Added the 'python_requires' argument to setup() to specify the supported
  Python versions in the package metadata. Installers such as pip depend
  on that, and there are issues such as #1448 when the installer does not
  have that information in the package.

Signed-off-by: Andreas Maier <[email protected]>

Author: andy-maier

CHANGES.txt

@@ -21,6 +21,9 @@ Coming in build 306, as yet unreleased
 
 * Support for Python 3.6 was dropped, support for later versions was improved.
 
+* The supported Python versions are now provided in the package metadata for
+  use by installers such as pip (#1448)
+
 Build 305, released 2022-11-06
 ------------------------------
 * Installation .exe files were deprecated.

setup.py

@@ -2249,6 +2249,8 @@ def convert_optional_data_files(files):
     "Programming Language :: Python :: Implementation :: CPython",
 ]
 
+python_requires = ">=3.7"
+
 if "bdist_wininst" in sys.argv:
     # fixup https://github.com/pypa/setuptools/issues/3284
     def maybe_fixup_exes():
@@ -2301,6 +2303,7 @@ def maybe_fixup_exes():
     url="https://github.com/mhammond/pywin32",
     license="PSF",
     classifiers=classifiers,
+    python_requires=python_requires,
     cmdclass=cmdclass,
     options={
         "bdist_wininst": {