小甲鱼第六天 python

1.字符串、元组、列表属序列类型

字典属映射类型 #{} dict1([])

1 dict1 = {'李宁':'一切皆有可能','nick':'just do it'}
2 print('nick的口号是:',dict1['nick'])
>>>nick的口号是:just do it
dict1['999']='9999'
>>>dict={'李宁':'一切皆有可能','nick':'just do it','999':'9999'}

dict={}
dict.fromkeys(s[,v])  #S置点箭值，v对应值
dict.fromkeys((1,2,3),'a')
{1:'a',2:'a',3:'a'}

1 dict = dict.fromkeys(rang(10),'赞') 2 for eachKey/Value/item in dict.keys/values/items():

 1 >>> a={1:'one',2:'b',3:'c'}
 2 
 3 >>> a
 4 {1: 'one', 2: 'b', 3: 'c'}
 5 >>> b=a.copy()
 6 >>> c=a
 7 >>> c
 8 {1: 'one', 2: 'b', 3: 'c'}
 9 >>> a
10 {1: 'one', 2: 'b', 3: 'c'}
11 >>> b
12 {1: 'one', 2: 'b', 3: 'c'}
13 >>> id(a)
14 48463160
15 >>> id(b)
16 49312608
17 >>> id(c)
18 48463160
19 >>> c[4]='four'
20 >>> c
21 {1: 'one', 2: 'b', 3: 'c', 4: 'four'}
22 >>> b
23 {1: 'one', 2: 'b', 3: 'c'}
24 >>> a
25 {1: 'one', 2: 'b', 3: 'c', 4: 'four'}
26 >>>

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posted on 2018-03-05 13:24 GhostAatrox 阅读(160) 评论(0) 收藏举报