Python练习五：字典

字典两大特点：无序，键唯一

创建字典

1 dic1 = {'name':'CatdeXin','age':22,'bobby':'学习','Speciality':'跑步'}
2 dic2 = dict((('name','CatdeXin'),))
3 print(dic1)
4 print(dic2)

对应操作

增

 1 dic3 = {}
 2 dic3['name'] = 'Miao'
 3 dic3['age'] = 12
 4 print(dic3) 
 5 #{'name': 'Miao', 'age': 12}
 
 7 a = dic3.setdefault('name','yue')
 8 b = dic3.setdefault('ages',18)
 9 print(a,b)      
10 #yue 18
11 print(dic3)     
12 #{'name': 'yue', 'ages': 18}