def fromkeys(cls, iterable, value=None):
            '''OD.fromkeys(S[, v]) -> New ordered dictionary with keys from S
            and values equal to v (which defaults to None).

            '''
            d = cls()
            for key in iterable:
                d[key] = value
            return d
OD.fromkeys(S[, v]) -> New ordered dictionary with keys from S
            and values equal to v (which defaults to None).

            
stackoverflow/venv/lib/python3.6/site-packages/pip-19.0.3-py3.6.egg/pip/_vendor/distlib/compat.py