CreateNumpyVector writes a numpy array into the buffer.

def CreateNumpyVector(self, x):
        """CreateNumpyVector writes a numpy array into the buffer."""

        if np is None:
            # Numpy is required for this feature
            raise NumpyRequiredForThisFeature("Numpy was not found.")

        if not isinstance(x, np.ndarray):
            raise TypeError("non-numpy-ndarray passed to CreateNumpyVector")

        if x.dtype.kind not in ['b', 'i', 'u', 'f']:
            raise TypeError("numpy-ndarray holds elements of unsupported datatype")

        if x.ndim > 1:
            raise TypeError("multidimensional-ndarray passed to CreateNumpyVector")

        self.StartVector(x.itemsize, x.size, x.dtype.alignment)

        # Ensure little endian byte ordering
        if x.dtype.str[0] == "<":
            x_lend = x
        else:
            x_lend = x.byteswap(inplace=False)

        # Calculate total length
        l = UOffsetTFlags.py_type(x_lend.itemsize * x_lend.size)
        ## @cond FLATBUFFERS_INTERNAL
        self.head = UOffsetTFlags.py_type(self.Head() - l)
        ## @endcond

        # tobytes ensures c_contiguous ordering
        self.Bytes[self.Head():self.Head()+l] = x_lend.tobytes(order='C')
        
        return self.EndVector(x.size)