[Python] How to swap the rows of a numpy array

I tried implementing a function to swap the rows of a numpy array, but it does not seem to work

This is the code:

def SwapRows(M: np.ndarray, row_num_1: int, row_num_2: int) -> np.ndarray:
M_copy = M.copy()
# exchange row 1 and row 2
temp = M_copy[row_num_1]
M_copy[row_num_1] = M_copy[row_num_2]
M_copy[row_num_2] = temp # I dont know why this method does not seem to work

return M_copy


any ideas as to why?

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