python函数形参和实参

#!/usr/bin/python
#coding:utf8        #中文输入方式1
#coding=utf8        #中文输入方式2
#encoding:utf8      #中文输入方式3
#encoding=utf8      #中文输入方式4
#-*- coding:utf8 -*-#中文输入方式5

print '*'*35
print "实现输入两个变量的比较功能:"
def fun(x,y):# x,y  形参
    if x == y:
        print x, '=', y
    else:
        print x, '!=', y
x1 = raw_input("The first var:")
x2 = raw_input("The second var:")

fun(x1,x2)
print '*'*35

print '^'*35
print "冰淇淋制作机器！"
print "machine for ice cream:"
def machine(x=8,y='菠萝'):#x,y形参，设置默认初值
    print "生成一个",x,'元,',y,'口味的冰淇淋！'

#s1 = raw_input("input something:")
#s2 = raw_input("input something:")
machine()               #使用默认参量
machine(3)              #只改变x参量
machine(y='奶油')       #只改变y参量
machine(5,'巧克力')     # s1,s2 shican
print '-'*35

print "machine1 for ice cream:"
def machine1(y,x=3):#默认参数从右至左
    print "生成一个",x,'元,',y,'口味的甜点！'
machine1('奶油')
print "^"*35
print "Edited by tianzhaixing"
print "2013.11.28"