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Python Language Constants


Example

math modules includes two commonly used mathematical constants.

  • math.pi - The mathematical constant pi
  • math.e - The mathematical constant e (base of natural logarithm)
>>> from math import pi, e
>>> pi
3.141592653589793
>>> e
2.718281828459045
>>>

Python 3.5 and higher have constants for infinity and NaN ("not a number"). The older syntax of passing a string to float() still works.

Python 3.x3.5
math.inf == float('inf')
# Out: True

-math.inf == float('-inf')
# Out: True

# NaN never compares equal to anything, even itself
math.nan == float('nan')
# Out: False