1cdef extern from "Python.h":
2    ctypedef int int32_t
3    ctypedef int int64_t
4    ctypedef unsigned int uint32_t
5    ctypedef unsigned int uint64_t
6
7    const Py_ssize_t PY_SSIZE_T_MIN
8    const Py_ssize_t PY_SSIZE_T_MAX
9