math.e

from math import e

print ("Euler's Number: ",e)

Euler's Number: 2.718281828459045

math.pi

from math import pi

print ("Mathematical constant π: ",pi)

Mathematical constant π: 3.141592653589793

math.tau

from math import tau

print ("Mathematical constant Ï„ : ",tau)

Mathematical constant Ï„ : 6.283185307179586

math.inf

from math import inf

print ("Positive infinity: ",inf, "is equal to", float("Inf"))
print ("Negative infinity: ",-inf, "is equal to", float("-Inf"))

Positive infinity: inf is equal to inf
Negative infinity: -inf is equal to -inf

math.nan

from math import nan

print ("Not a number:", nan, "is equal to", float("nan"))

Not a number: nan is equal to nan