PR: pyflakes nit2: Remove as e

[edreamleo]

We all know the pattern:

except SomeException as e:
    ...

In this case, however, e isn't used. The existing code adds a # noqa comment, but there is no way to turn off the pyflakes complaint:

patchedast.py:925:9: local variable 'e' is assigned to but never used

Imo, there is no need to fussily add the as e: # noqa.

@lieryan I'll be happy to add any comment you like just below the changed line.

[lieryan]

Looks fine to me, there's no need for extra comment here.

[edreamleo]

@lieryan Thanks!