On 28 November 2016 at 13:28, Tomas Orsava <torsava@redhat.com> wrote:
The ``.missing.py`` extension will be added to the end of the list, and configured to be handled by ``SourceFileLoader``. Thus, if a module is not found in its proper location, the ``XYZ.missing.py`` file is found and executed, and further locations are not searched.
Am I right to think that if a user had a file tkinter.missing.py in the current directory, then they'd get that in preference to the stdlib tkinter? Obviously this is no different from having a tkinter.py file in that directory, so it's not like this is a major problem, but it might be worth pointing out this minor incompatibility. Also, and possibly more of an issue, use of the ".missing.py" file will mean that a user can't provide their own implementation of the module later on sys.path. I don'rt know if this is a significant issue on Unix platforms. On Windows, there is a 3rd party implementation of the curses module which (as I understand it) can be user installed. If Python included a curses.missing.py, that would no longer work. Certainly these are only minor points, but worth considering. Paul