Function warn

numpy/testing/tests/test_utils.py:1342–1344

(arr)

        # Apply along axis is implemented in python; stacklevel=2 means
        # we end up inside its module, not ours.
        def warn(arr):
            warnings.warn("Some warning 2", stacklevel=2)
            return arr
        np.apply_along_axis(warn, 0, [0])

    # Test module based warning suppression: