python 字典

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字典：

1.语法：

DicName = {

“key1” : “value” ,

“key2” : “value 2”

}

Contacs = {

‘Alex’:‘13651054608’ ,

‘Rachel Chan’:‘1378223945’,

‘Rain Wang’:‘87645342’

}line

2.定义字典：

>>> name = {'a': '12332445345', 'b': '13311113333'}

3.查看其中的信息：

>>> name['b']

'13311113333'

>>> name['a']

'12332445345'

4.查看key

>>> name.keys()

['a', 'b']

5.查看values

>>> name.values()

['12332445345', '13311113333']

6.字典中添加数据

>>> name['c']='13311177843'

>>> name

{'yulei': '13311177843', 'a': '12332445345', 'b': '13311113333'}

7.数据的删除

删除最后添加的一个

>>> name.popitem()

('yulei', '13311177843')

>>> name

{'a': '12332445345', 'b': '13311113333'}

删除其中某条数据

>>> name.pop('a')

'12332445345'

>>> name

{'b': '13311113333'}

8。更改其中的values

>>> name

{'b': '13311113333'}

>>> name['b'] = '25'

>>> name

{'b': '25'}

9.判断某个key在字典中是否存在

>>> name.has_key('b')

True

>>> name.has_key('c')

False

10.以元组的形式显示数据

>>> name.items()

[('c', '24'), ('a', '27'), ('b', '25')]

11.字典的遍历

>>> for key_num,values in name.items():

print "name is %s,ege is %s " % (key_num,values)

name is c,ege is 24

name is a,ege is 27

name is b,ege is 25