cython

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__doc__ = u"""
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>>> foo = Foo()
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>>> fee = Fee()
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>>> faa = Faa()
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>>> fee.bof()
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Fee bof 0
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>>> faa.bof()
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Foo bof 0
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"""
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cdef class Foo:
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  cdef int val
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  def __init__(self):
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    self.val = 0
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cdef class Fee(Foo):
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  def bof(self):
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    print u'Fee bof', self.val
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cdef class Faa(Fee):
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  def bof(self):
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    print u'Foo bof', self.val
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