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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 get_float_info(self, field):
 """Get float property from the DMatrix. Parameters field: str The field name of the information Returns ------- info : array a numpy array of float information of the data """

        length = ctypes.c_ulong()
        ret = ctypes.POINTER(ctypes.c_float)()
        _check_call(_LIB.XGDMatrixGetFloatInfo(self.handle,
                                               c_str(field),
                                               ctypes.byref(length),
                                               ctypes.byref(ret)))
        return ctypes2numpy(ret, length.value, np.float32)