Serhiy Storchaka added the comment:
dict.pop() supports unhashable values, but dict.__contains__() and dict.get()
don't:
>>> [] in {}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
>>> {}.get([], 42)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
>>> {}.pop([], 42)
42
OrderedDict.pop() also doesn't support unhashable values:
>>> collections.OrderedDict().pop([], 42)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
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<http://bugs.python.org/issue30100>
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