Bug report

A change was made in Python v3.8 where, on Windows, EXT_SUFFIX was initialised from the first element of the list returned by _imp.extension_suffixes(). In previous versions this was hardcoded to '.pyd'. When HAVE_DYNAMIC_LOADING is not defined the list of suffixes will always be empty resulting in a IndexError exception being raised.

Your environment

Windows. Python v3.8 to v3.11.

• PR:gh-99201: fix IndexError when initializing sysconfig config variables #99274