5.2.4. Creating arrays of zeros or ones

To create arrays filled with zeros or ones, we use the np.zeros and np.ones functions, which both take the shape of the array to create:

import numpy as np

np.zeros((2, 5))

array([[0., 0., 0., 0., 0.],
       [0., 0., 0., 0., 0.]])

np.ones((3, 4))

array([[1., 1., 1., 1.],
       [1., 1., 1., 1.],
       [1., 1., 1., 1.]])

Tip

Note the double parenthesis. The argument of np.zeros and np.ones is a shape, which is a tuple. Writing np.zeros(2, 5) would generate an error, since this is not one tuple argument, but two integer arguments.