Python 初体验之 对象的引用和拷贝
Python 初体验之 对象的引用和拷贝
写过Java的都知道，这个对象的引用和对象的clone是完全不用的一回事，作为面向对象的语言，Python也不例外，他的大部分声明或者使用一个变量都是对于对象的引用，但是偶尔情况下面我们也会不得不使用对象的clone，下
面我们来一个例子说明一下这个对象的clone和对象的引用的区别，这个很重要。
首先看一下代码
[python]
'''''
Created on 2013-1-25
@author: Administrator
'''
shoplist = ['Apple','mango','carrot','banana']
mylist = shoplist
del shoplist[0]
print("shoplist is",shoplist)
print("mylist is",mylist)
#下面使用拷贝
mylist = shoplist[:]
del shoplist[0]
print("shoplist is",shoplist)
print("mylist is",mylist)
'''
Created on 2013-1-25
@author: Administrator
'''
shoplist = ['Apple','mango','carrot','banana']
mylist = shoplist
del shoplist[0]
print("shoplist is",shoplist)
print("mylist is",mylist)
#下面使用拷贝
mylist = shoplist[:]
del shoplist[0]
print("shoplist is",shoplist)
print("mylist is",mylist)
输出的结果为
[python]
shoplist is ['mango', 'carrot', 'banana']
mylist is ['mango', 'carrot', 'banana']
shoplist is ['carrot', 'banana']
mylist is ['mango', 'carrot', 'banana']
shoplist is ['mango', 'carrot', 'banana']
mylist is ['mango', 'carrot', 'banana']
shoplist is ['carrot', 'banana']
mylist is ['mango', 'carrot', 'banana']
大家可以很清楚的看出来，这个序列的引用和对象的clone是什么个概念，主要是需要熟悉一下这个序列的clone。，
就是使用shoplist[:]，不一定常用，但是mark一下
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