python学习总结之数据结构

• Z时代
• 2024-01-10
• 分类：综合

python中有三种内建的数据结构------列表，元组，字典

List：列表l是一组有序项目的数据结构，可增可减。表示方式：shoplist=['apple','banana','bango']

#!/usr/bin/python</p><p>#filename:using_list.py</p><p>shoplist=['apple','mango','carrot','banana']</p><p>print 'I have',len(shoplist),'items to purchase.'</p><p>print 'There items are:',</p><p>for item in shoplist:</p><p> print item,</p><p>print '\nI also have to buy rice.'</p><p>shoplist.append('rice')</p><p>print 'my shopping list is now', shoplist</p><p>print 'I will sort my list now', shoplist.sort()</p><p>print 'Sort shopping list is', shoplist</p><p>print 'The first item I will buy is',shoplist[0]</p><p>olditem=shoplist[0]</p><p>del shoplist[0]</p><p>print 'I brought the', olditem</p><p>print 'my shopping list is now ', shoplist</p><p>结果显示：其中函数sort()排序作用，del删除的作用，append()增加的作用，基本上都是英语本身的意思。

[root@fsailing1 python]# python using_list.py</p><p>I have 4 items to purchase.</p><p>There items are: apple mango carrot banana</p><p>I also have to buy rice.</p><p>my shopping list is now ['apple', 'mango', 'carrot', 'banana', 'rice']</p><p>I will sort my list now None</p><p>Sort shopping list is ['apple', 'banana', 'carrot', 'mango', 'rice']</p><p>The first item I will buy is apple</p><p>I brought the apple</p><p>my shopping list is now ['banana', 'carrot', 'mango', 'rice']</p><p>元组：和列表十分相似，只不过元组和字符串一样是不可变的也就是说你不能修改元组：

zoo=('wolf','elephant','penguin'),zoo[2]表示元组中第三个项目

#!/usr/bin/python</p><p>#filename:print_tuple.py</p><p>age=27</p><p>name='chenbinghui'</p><p>print '%s is %d years old' % (name,age)</p><p>print 'why is %s playing with that python?' %name结果显示
[root@fsailing1 python]# python using_tuple.py</p><p>chenbinghui is 27 years old</p><p>why is chenbinghui playing with that python?</p><p>字典：相当于我们说的键值对一样，一个键值对应一个值并且键是唯一的。字典是dict类的实例/对象

d={key1:value1,key2:value2}

#!/usr/bin/python</p><p>#filename:using_dict.py</p><p>ab={'chen':'chenbinghuilove@126.com','zhou':'zhouqian@126.com','zhao':'zhaogang@qq.com'}</p><p>print "chen's address is %s" %ab['chen']</p><p># Adding a key/value pair</p><p>ab['xiaoxiao']='xiaoxiao@126.com'</p><p>#deleting a key/value pair</p><p>del ab['zhao']</p><p>print '\nThere are %d contacts in the address-book\n' %len(ab)</p><p>for name,address in ab.items():</p><p> print 'contact %s at %s' %(name,address)</p><p>if 'zhou' in ab:</p><p> print "\nzhou's address is %s" %ab['zhou']结果显示：可以看到添加的写法，和删除的写法，这里的item()方法也可以换成是has_key

[root@fsailing1 python]# python using_dict.py</p><p>chen's address is chenbinghuilove@126.com</p><p>There are 3 contacts in the address-book</p><p>contact chen at chenbinghuilove@126.com</p><p>contact xiaoxiao at xiaoxiao@126.com</p><p>contact zhou at zhouqian@126.com</p><p>zhou's address is zhouqian@126.com</p><p>

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