cython

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# Internals of the "long" type (Python 2) or "int" type (Python 3).
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cdef extern from "Python.h":
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    """
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    #if PY_MAJOR_VERSION < 3
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     #include "longintrepr.h"
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    #endif
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    """
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    ctypedef unsigned int digit
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    ctypedef int sdigit  # Python >= 2.7 only
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    ctypedef class __builtin__.py_long [object PyLongObject]:
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        cdef digit* ob_digit
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    cdef py_long _PyLong_New(Py_ssize_t s)
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    cdef long PyLong_SHIFT
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    cdef digit PyLong_BASE
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    cdef digit PyLong_MASK
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