やったこと
numpy.zeros を使ってみます。
確認環境
$ python
Python 3.6.2 |Anaconda custom (64-bit)| (default, Sep 21 2017, 18:29:43)
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy as np
>>> np.__version__
'1.16.4'
調査
>>> import numpy as np
>>> np.zeros(5)
array([0., 0., 0., 0., 0.])
>>> np.zeros((3, 3))
array([[0., 0., 0.],
[0., 0., 0.],
[0., 0., 0.]])
>>> np.zeros((4, 2))
array([[0., 0.],
[0., 0.],
[0., 0.],
[0., 0.]])