Testing for positive infinity, or negative infinity, individually in Python

Question

math.isinf() tests for positive or negative infinity lumped together. What\'s the pythonic way to test for them distinctly?

Ways to test for positive infinity:

Answer 1

there is also numpy

>>> import numpy as np
>>> np.isneginf([np.inf, 0, -np.inf])
array([False, False,  True], dtype=bool)
>>> np.isposinf([np.inf, 0, -np.inf])
array([ True, False, False], dtype=bool)

and then there is general isinf

>>> np.isinf([np.inf, 0, -np.inf])
array([ True, False,  True], dtype=bool)