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as_sequence comes after as_mapping, so that the mapping wins when both the mapping and the sequence define a given operator (e.g. __getitem__). see add_operators() in typeobject.c .
Availability: >= 2.5
Availability: >= 2.5
Availability: >= 2.5
Availability: 2.4
Availability: 2.4
Availability: 2.4
The *real* layout of a type object when allocated on the heap