A Mapping is a generic container for associating key/value
pairs.
This class provides concrete generic implementations of all
methods except for __getitem__, __iter__, and __len__.
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get(k[, d]) → D[k] if k in D, else d. d defaults to None.
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items() → list of D's (key, value) pairs, as 2-tuples
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iteritems() → an iterator over the (key, value) items of D
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iterkeys() → an iterator over the keys of D
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itervalues() → an iterator over the values of D
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keys() → list of D's keys
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values() → list of D's values