Use imp.find_module to get module info

[asottile]

I've noticed you've written a thing that iterates prefix entries. imp.find_module is potentially a better / more-accurate source of truth (especially when .pth shenanigans are involved). I've also noticed that your module seems to prefer "application" classification when running in an isolated virtualenv, not sure if that's related or not.

Similar code from my implementation before finding yours (ugh google why do you fail me):

https://github.com/asottile/aspy.refactor_imports/blob/master/aspy/refactor_imports/classify.py#L29-L62

[timothycrosley]

Hi @asottile,

Thanks so much for providing your input. I like that implementation, but unfortunately cannot use it as it goes against one of isort's current design goals (portability), currently a lot of users install isort as a binary tool once running on Python2 or 3 and then run it against code using both versions, if imp.find_module is used it will fail in several cases because isort is running against Python 2 code but itself running on Python 3 or vice versa.

Thanks!

~Timothy Crosley