cython

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cdef class A:
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    def numerator(self):
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        return self
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cdef int  bitsize(A a):
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    return 1
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coeffs = [A()]
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class B:
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    """
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    >>> B().coeffs_bitsize()
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    [2]
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    """
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    def coeffs_bitsize(self):
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        r = [bitsize(c.numerator())+1 for c in coeffs]
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        return r
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