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:/home/python#python python_numpy_array_split_7.py
[array([[ 1],
[ 4],
[ 7],
[10],
[13],
[16]]), array([[ 2],
[ 5],
[ 8],
[11],
[14],
[17]]), array([[ 3],
[ 6],
[ 9],
[12],
[15],
[18]])]