有如下字典:
favorite_languages ={
‘jen’:’python’,
‘sarah’:’c’,
‘edward’:’ruby’,
‘phil’:’python’,
}
一、访问字典中的值
print(favorite_languages[‘jen’]),会返回 python
二、添加值到字典中
favorite_languages[‘tom’] = ‘c++’
三、修改字典中的值
favorite_languages[‘tom’] = ‘c’
四、删除键-值对
del favorite_languages[‘tom’]
五、遍历所有的键-值对
for i in favorite_languages.items():
print(i[0])
print(i[1])
六、遍历所有的键
for k in favorite_languages.keys():
六、用sorted按照顺序遍历所有的键
for k in sorted(favorite_languages.keys()):
七、遍历所有的值
for v in favorite_languages.vaules():
八、使用set去除重复项目
for v in set(favorite_languages.vaules()):
九、嵌套、存储列表
|1. 嵌套
d1 ={ }
d2 ={ }
d3 ={ }
dicts ={d1,d2,d3 }
2. 列表
d1 ={ }
list = []
dicts ={d1,list }
|