cython

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__doc__ = u"""
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   >>> str('test')
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   'test'
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   >>> z
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   'test'
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"""
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cimport cython
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s = str
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z = str('test')
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def c(string):
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    """
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    >>> c('testing')
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    'testing'
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    """
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    return str(string)
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class subs(str):
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    """
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    >>> subs('testing a subtype')
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    'testing a subtype'
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    #   >>> csub('testing a subtype')
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    #   'testing a subtype'
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    #   >>> csubs('testing a subtype')
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    #   'testing a subtype'
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    """
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    pass
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def sub(string):
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    """
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    >>> sub('testing a subtype')
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    'testing a subtype'
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    """
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    return subs(string)
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#cdef class subs(str):
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#    pass
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#def csub(string):
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#    return csubs(string)
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@cython.test_fail_if_path_exists("//SimpleCallNode")
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@cython.test_assert_path_exists("//PythonCapiCallNode")
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def typed(str s):
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    """
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    >>> print(typed(None))
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    None
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    >>> type(typed(None)) is type(typed(None))
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    True
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    >>> print(typed('abc'))
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    abc
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    >>> type(typed('abc')) is type(typed('abc'))
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    True
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    """
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    return str(s)
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@cython.test_fail_if_path_exists(
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    "//SimpleCallNode",
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    "//PythonCapiCallNode",
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)
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def typed_not_none(str s not None):
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    """
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    >>> print(typed('abc'))
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    abc
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    >>> type(typed('abc')) is type(typed('abc'))
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    True
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    """
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    return str(s)
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