__doc__ = u"""

    >>> a = A()

    >>> a.foo()

    (True, 'yo')

    >>> a.foo(False)

    (False, 'yo')

    >>> a.foo(10, 'yes')

    (True, 'yes')

"""

cdef class A:

    cpdef foo(self, bint a=True, b="yo"):

        return a, b

def call0():

    """

    >>> call0()

    (True, 'yo')

    """

    cdef A a = A()

    return a.foo()

def call1():

    """

    >>> call1()

    (False, 'yo')

    """

    cdef A a = A()

    return a.foo(False)

def call2():

    """

    >>> call2()

    (False, 'go')

    """

    cdef A a = A()

    return a.foo(False, "go")