http://docs.python.org/library/stdtypes.html#mapping-types-dict
키가 있는지 검사하려면 아래와 같이 한다:
key in d
Return True if d has a key key, else False.
New in version 2.2.
- key not in d
-
Equivalent to not key in d.
New in version 2.2.
has_key(key)
Test for the presence of key in the dictionary. has_key() is deprecated in favor of key in d.
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