Permit import of .pyw under Linux

Feature or enhancement

To allow under Linux the execution of a script written under Windows, importing modules, some of which have the .pyw file extension, it would be useful to allow linux to import the .pyw files.

Pitch

Sometimes you want to run under linux a script written under windows which import modules, some having the file extension ".pyw". Today, we are forced to rename all pyw files to py to switch from Windows to Linux. But this is not always desirable, if you use a third party script or if you work cooperatively on a project, with developers under Windows and Linux. Moreover, there is no solution to recognize the py files to be renamed to pyw when you want to switch back to Windows.

Previous discussion

Importing .pyw files has been discussed here :
https://mail.python.org/pipermail/patches/2001-August/005411.html
And it is mentioned that "with slight modification, it could
permit the extension on any platform if desired"

Another discussion on the subject :
https://stackoverflow.com/questions/21386094/importing-pyw-files-as-modules-under-linux

未指定任何实现文件、测试或入口点。首先审查 Python 在 Linux 下对 .pyw 文件的导入行为以及链接的两项讨论；定义跨平台行为，并添加测试来证明无需重命名文件即可成功导入。