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"""This module contains a code example related to
Think Python, 2nd Edition
by Allen Downey
http://thinkpython2.com
Copyright 2015 Allen Downey
License: http://creativecommons.org/licenses/by/4.0/
from __future__ import print_function, division
def invert_dict(d):
    """Inverts a dictionary, returning a map from val to a list of keys.
    If the mapping key->val appears in d, then in the new dictionary
    val maps to a list that includes key.
    d: dict
    Returns: dict
    inverse = {}
    for key in d:
        val = d[key]
        inverse.setdefault(val, []).append(key)
    return inverse
if __name__ == '__main__':
    d = dict(a=1, b=2, c=3, z=1)
    inverse = invert_dict(d)
    for val in inverse:
        keys = inverse[val]
        print(val, keys)

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