[issue13959] Re-implement parts of imp in pure Python

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

Yes.

And the [:] copies the list so I don't accidentally mutate in-place (did that once already, so now I'm just being paranoid; I doubt I need it hardly anywhere I don't do +=).

As for using SOURCE_SUFFIXES[0], I'm done following the ported code. I really don't care if .pyw isn't supported in that case. But in general people shouldn't assume just .py (or .py at all).

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