cython

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cdef class Parrot:
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    cdef object plumage
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    def __init__(self):
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        self.plumage = "yellow"
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    def describe(self):
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        print "This bird has lovely", self.plumage, "plumage."
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cdef class Norwegian(Parrot):
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    def __init__(self):
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        self.plumage = "blue"
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