how to convert string endwith in python code example

Example: python string ends with

#!/usr/bin/python

str = "this is string example....wow!!!";

suffix = "wow!!!";
print str.endswith(suffix)
print str.endswith(suffix,20)

suffix = "is";
print str.endswith(suffix, 2, 4)
print str.endswith(suffix, 2, 6)