numpy基础代码操练

In [20]: b[0,:,1] Out[20]: array([1, 5, 9]) In [21]: b[0,:,1] Out[21]: array([1, 5, 9]) In [22]: b[0,:,-1] Out[22]: array([ 3, 7, 11]) In [23]: b[0,::-1, -1] Out[23]: array([11, 7, 3]) In [24]:

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