what is r strip function in python

#!/usr/bin/python

str = "     this is string example....wow!!!     ";
print str.rstrip()
str = "88888888this is string example....wow!!!8888888";
print str.rstrip('8')

#the answer

#this is string example....wow!!!
#88888888this is string example....wow!!!

#use the def keyword to declare a function in Python
def function(args,kwargs='attribute'):
    #here is the returned value
    return 'return value'