Python实现计算器功能

#!/usr/bin/python # -*- coding:UTF-8 -*- def sum(options,x,y):     t = options     if(t == "+"):         print "x+y=",x+y     elif(t == "-"):         print "x-y=",x-y     elif(t == "*"):         print "x*y=",x*y     else:         print "x/y=",x/y def main():     options = raw_input("Please enter a method:")     x = input("Enter a Num:")     y = input("Enter another Num:")     sum(options,x,y) if __name__ == '__main__':     main()