In this chapter routine docstrings are presented, grouped by functionality. Many docstrings contain example code, which demonstrates basic usage of the routine. The examples assume that NumPy is imported with:
>>> import numpy as np
A convenient way to execute examples is the %doctest_mode mode of IPython, which allows for pasting of multi-line examples and preserves indentation.
numpy.ctypeslib)numpy.dual) numpy.emath)numpy.fft) numpy.linalg) numpy.matlib) numpy.random) numpy.testing) 
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    https://docs.scipy.org/doc/numpy-1.17.0/reference/routines.html