cython

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cimport cython
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@cython.final
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cdef class FinalClass:
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    """
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    >>> f = FinalClass()
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    >>> test_final_class(f)
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    Type tested
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    >>> try:
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    ...     class SubType(FinalClass): pass
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    ... except TypeError:
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    ...     print('PASSED!')
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    PASSED!
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    """
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cdef class NonFinalClass:
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    """
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    >>> class SubType(NonFinalClass): pass
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    >>> s = SubType()
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    """
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@cython.final
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cdef class FinalSubClass(NonFinalClass):
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    """
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    >>> f = FinalSubClass()
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    >>> test_non_final_class(f)
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    Type tested
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    >>> try:
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    ...     class SubType(FinalSubClass): pass
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    ... except TypeError:
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    ...     print('PASSED!')
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    PASSED!
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    """
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def test_final_class(FinalClass c):
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    print u"Type tested"
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def test_non_final_class(NonFinalClass c):
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    print u"Type tested"
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