Correcting the pyinfo.py file

[soma2000-lang]

Description

Made some change in the code

https://github.com/python/mypy/blob/master/mypy/pyinfo.py#L22

Test Plan

fixes issue #12202

[soma2000-lang]

@hauntsaninja Please look into this

[emmatyping]

Hi, thank you for your PR. Unfortunately, these changes are not correct. The file does have to run under Python 2 (at least for now) since mypy can still type check Python 2 code. In addition, your change to the return of the getprefixes() function is not correct, instead of returning both the base_prefix and prefix (note the return type is a tuple of str), it will only return the prefix if the base prefix is None or the empty string.

[emmatyping]

Oh I see you are trying to fix #12202. In that case I would change the check to be hasattr(sys, "base_prefix").

[hauntsaninja]

Thank you, but superseded by #12244
Closing since this isn't a correct fix, it's been a couple days since Ethan's review, and I want to make sure the issue is fixed in the next release.