isort-compatible style

[Dreamsorcerer]

Would be nice to have an isort-compatible style built-in.

This would appear to be the same as the pycharm style, but with ordering done as:
from foo import GLOBAL_VAR, ClassName, func
rather than
from foo import ClassName, GLOBAL_VAR, func

i.e. it needs to group the ordering into 3 parts, ALLCAPS, CapWords and lowercase.

Sorting code for this could be as simple as:

group = lambda k: 0 if k.isupper() else 2 if k.islower() else 1
key = lambda k: (group(k), k)

>>> a = ("GLOBAL_VAR", "ClassName", "func")
>>> sorted(a, key=key)
['GLOBAL_VAR', 'ClassName', 'func']

[sigmavirus24]

See #163. Requests for work on the part of the maintainers ("Would be nice ...") aren't going to be actioned.