cython

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__doc__ = u"""
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    >>> a = A()
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    >>> a.foo()
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    (True, 'yo')
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    >>> a.foo(False)
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    (False, 'yo')
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    >>> a.foo(10, 'yes')
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    (True, 'yes')
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"""
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cdef class A:
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    cpdef foo(self, bint a=True, b="yo"):
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        return a, b
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def call0():
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    """
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    >>> call0()
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    (True, 'yo')
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    """
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    cdef A a = A()
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    return a.foo()
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def call1():
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    """
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    >>> call1()
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    (False, 'yo')
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    """
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    cdef A a = A()
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    return a.foo(False)
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def call2():
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    """
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    >>> call2()
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    (False, 'go')
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    """
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    cdef A a = A()
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    return a.foo(False, "go")
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