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def test_str_subclass_kwargs(k=None):
"""
Test passing keywords with names that are not of type ``str``
but a subclass:
>>> class StrSubclass(str):
... pass
>>> class StrNoCompare(str):
... def __eq__(self, other):
... raise RuntimeError("do not compare me")
... def __hash__(self):
... return hash(str(self))
>>> kwargs = {StrSubclass('k'): 'value'}
>>> test_str_subclass_kwargs(**kwargs)
'value'
>>> kwargs = {StrNoCompare('k'): 'value'}
>>> test_str_subclass_kwargs(**kwargs)
Traceback (most recent call last):
RuntimeError: do not compare me
"""
return k
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