Auto-correct misspellings of module attribute names

[JukkaL]

Mypy can suggest correct spellings for some attributes, but it doesn't seem to work for module attributes:

from subprocess import popen  # Module 'subprocess' has no attribute 'popen'

import subprocess
subprocess.popen  # Module has no attribute "popen"

class Foobar:
    def do_it(self): pass
foobar  # Name 'foobar' is not defined

Foobar().doit()  # "Foobar" has no attribute "doit"; maybe "do_it"?

It would be better if mypy would suggest corrections for all of the cases in the above example.

Marking as high priority since this should be easy to fix and pretty high impact.

[JukkaL]

#4926 is an example where this would have been useful.

[gvanrossum]

I'm not sure I'd call this high priority, compared to all the other open high priority issues.

[JukkaL]

Fair enough, marking as normal priority.

[marcodoordash]

looking at this issue

[marcodoordash]

@JukkaL as per our conversation, I referenced this in #824 as they partially overlap - could you please close this one?

[ilevkivskyi]

Closing in favor of #824