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#!/usr/bin/env python

# http://www.cnblogs.com/yuyan/archive/2012/04/21/2461673.html

def add_list(p):

p = p + [1]

p1 = [1,2,3]

add_list(p1)

print p1

def add_list1(p):

p += [1]

p2 = [1,2,3]

add_list1(p2)

print p2