The cmath.isfinite() function returns a boolean value indicating whether the input complex number is a finite number or not.

In Python some complex values which are not finite includes Infinity, represented as complex('inf') and NaN(Not a Number) represented as complex('nan') and any operations involving them.

x The value(real) or complex whose value should be checked for finiteness.

The function returns True if both the real and imaginary parts of x are finite, else False.

import cmath

print(cmath.isfinite(1 + 2j))
print(cmath.isfinite(11 + 7j))
print(cmath.isfinite(cmath.inf + 2j))