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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _init_rabit():
 """internal library initializer."""

    if _LIB is not None:
        _LIB.RabitGetRank.restype = ctypes.c_int
        _LIB.RabitGetWorldSize.restype = ctypes.c_int
        _LIB.RabitIsDistributed.restype = ctypes.c_int
        _LIB.RabitVersionNumber.restype = ctypes.c_int