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Description
https://numpy.org/doc/1.21/reference/generated/numpy.insert.html
b = np.array([[1, 2, 3], [4, 5, 6]])
array([[1, 2, 3],
[4, 5, 6]])
np.insert(b, 1, [7, 8, 9])
array([1, 7, 8, 9, 2, 3, 4, 5, 6])
np.insert(b, 1, [7, 8, 9], axis = 0)
array([[1, 2, 3],
[7, 8, 9],
[4, 5, 6]])