test_nditer.py 文件源码

def test_iter_nested_iters_reorder():
    # Test nested iteration basic usage
    a = arange(12).reshape(2, 3, 2)

    # In 'K' order (default), it gets reordered
    i, j = np.nested_iters(a, [[0], [2, 1]])
    vals = []
    for x in i:
        vals.append([y for y in j])
    assert_equal(vals, [[0, 1, 2, 3, 4, 5], [6, 7, 8, 9, 10, 11]])

    i, j = np.nested_iters(a, [[1, 0], [2]])
    vals = []
    for x in i:
        vals.append([y for y in j])
    assert_equal(vals, [[0, 1], [2, 3], [4, 5], [6, 7], [8, 9], [10, 11]])

    i, j = np.nested_iters(a, [[2, 0], [1]])
    vals = []
    for x in i:
        vals.append([y for y in j])
    assert_equal(vals, [[0, 2, 4], [1, 3, 5], [6, 8, 10], [7, 9, 11]])

    # In 'C' order, it doesn't
    i, j = np.nested_iters(a, [[0], [2, 1]], order='C')
    vals = []
    for x in i:
        vals.append([y for y in j])
    assert_equal(vals, [[0, 2, 4, 1, 3, 5], [6, 8, 10, 7, 9, 11]])

    i, j = np.nested_iters(a, [[1, 0], [2]], order='C')
    vals = []
    for x in i:
        vals.append([y for y in j])
    assert_equal(vals, [[0, 1], [6, 7], [2, 3], [8, 9], [4, 5], [10, 11]])

    i, j = np.nested_iters(a, [[2, 0], [1]], order='C')
    vals = []
    for x in i:
        vals.append([y for y in j])
    assert_equal(vals, [[0, 2, 4], [6, 8, 10], [1, 3, 5], [7, 9, 11]])