# The cmath module

This module contains a number of mathematical operations for complex numbers.

**Example: Using the cmath module**

# File: cmath-example-1.py import cmath print "pi", "=>", cmath.pi print "sqrt(-1)", "=>", cmath.sqrt(-1)

pi => 3.14159265359 sqrt(-1) => 1j

See the *Python
Library Reference* for a full list of functions.