Should I use scipy.pi, numpy.pi, or math.pi?

PythonNumpyScipyPi

Python Problem Overview

In a project using SciPy and NumPy, should I use scipy.pi, numpy.pi, or math.pi?

Python Solutions

Solution 1 - Python

>>> import math
>>> import numpy as np
>>> import scipy
>>> math.pi == np.pi == scipy.pi
True

So it doesn't matter, they are all the same value.

The only reason all three modules provide a pi value is so if you are using just one of the three modules, you can conveniently have access to pi without having to import another module. They're not providing different values for pi.

Solution 2 - Python

One thing to note is that not all libraries will use the same meaning for pi, of course, so it never hurts to know what you're using. For example, the symbolic math library Sympy's representation of pi is not the same as math and numpy:

import math
import numpy
import scipy
import sympy

print(math.pi == numpy.pi)
> True
print(math.pi == scipy.pi)
> True
print(math.pi == sympy.pi)
> False
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Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionDouglas B. StapleView Question on Stackoverflow
Solution 1 - PythonBrenBarnView Answer on Stackoverflow
Solution 2 - PythonjbayView Answer on Stackoverflow