#!/usr/bin/env python
# encoding: utf-8
#
# Copyright (c) 2010 Doug Hellmann.  All rights reserved.
#
"""Square roots
"""
#end_pymotw_header

import math

print math.sqrt(9.0)
print math.sqrt(3)
try:
    print math.sqrt(-1)
except ValueError, err:
    print 'Cannot compute sqrt(-1):', err