Louie Lu added the comment:
Additional note, the order will changed it random way in ChainMap, e.g.:
>>> for k, v in ChainMap({'a': 0, 'b': 1, 'c': 2}, {'b': 3, 'a': 4}).items():
>>> print(k, v)
...
a 0
c 2
b 1
-----restart----
>>> for k, v in ChainMap({'a': 0, 'b': 1, 'c': 2}, {'b': 3, 'a': 4}).items():
>>> print(k, v)
...
b 1
c 2
a 0
----------
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<http://bugs.python.org/issue30664>
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