1、添加键值对

#!/usr/bin/env pythoni1 = {'k1':'cai' , 'k2':123}print(i1)i1['k3'] = 0i1['k4'] = "rui"print(i1)====================================={'k1': 'cai', 'k2': 123}{'k1': 'cai', 'k2': 123, 'k3': 0, 'k4': 'rui'}

 

2、修改字典中的值

#!/usr/bin/env pythoni1 = {'k1':'cai' , 'k2':123}print(i1)i1['k1'] = 'rui'print(i1)================================{'k1': 'cai', 'k2': 123}{'k1': 'rui', 'k2': 123}

　　

3、删除键值对

i1 = {'k1':'cai' , 'k2':123}print(i1)del i1['k1']print(i1)====================================={'k1': 'cai', 'k2': 123}{'k2': 123}

　

#!/usr/bin/env pythoni1 = {'k1':'cai' , 'k2':123}for key,value in i1.items():    print(key,value)=======================================k1 caik2 123