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import numpy as np

if __name__ == "__main__":

arr = np.empty((8, 4))

for i in range(8):

arr[i] = i

print(arr)

print(arr[[4, 3, 0, 6]])

print(arr[[-3, -5, -7]])

arr = np.arange(32).reshape((8, 4))

print(arr)

print(arr[[1, 5, 7, 2], [0, 3, 1, 2]])

print(arr[[1, 5, 7, 2]][:, [0, 3, 1, 2]])