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import numpy as np
a = [[1,2,3],[4,5,6]]
arr = np.array(a)
arr + 10
array([[11, 12, 13],
       [14, 15, 16]])
arr / 10
array([[0.1, 0.2, 0.3],
       [0.4, 0.5, 0.6]])
arr * 10.0
array([[10., 20., 30.],
       [40., 50., 60.]])