cython

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