Rename mock attrs in py3

[mxr]

Resolves #80

[rkm]

Hey folks, I've picked this up and added to @mxr's work here. I believe this resolves a couple of the open comments.

[mxr]

@rkm thanks for that!

@asottile I scoped down the change and avoided changing usage output, let me know your thoughts

[asottile]

can we also handle import mock => from unittest import mock? (or at least add a test demonstrating it works, it might already work!)

I believe there's also some sub-namespaces inside mock that sometimes get auto-populated by greedy IDEs that we could do as well (iirc from mock.mock import Mock?) (don't worry about this for a first pass though -- fine to ignore this suggestion)

[mxr]

can we also handle import mock => from unittest import mock? (or at least add a test demonstrating it works, it might already work!)

It doesn't already work, looks like the code bails out here. Added an xfailing test in the meantime, not sure how useful that is but it's something 😛

I believe there's also some sub-namespaces inside mock that sometimes get auto-populated by greedy IDEs that we could do as well (iirc from mock.mock import Mock?) (don't worry about this for a first pass though -- fine to ignore this suggestion)

Took a stab at it in this PR. Looks like all the attributes are eligible for this rewrite

[mxr]

🥂 ty!