'''字典'''

‘’‘字典’’’

键值结构，dict_new={‘name’:‘xu’,‘age’:18,‘tel’:123}

dict_new={‘name’:‘xiaoxu’,‘age’:18,‘tel’:123}

print(dict_new.keys())

print(dict_new.values())

print(dict_new[‘name’])

字典查询与修改

print(dict_new[‘age’])

get

ret1=dict_new.get(‘name1’)# get获取指定键值，有则返回默认值，若无则返回none,不存在不报错

print(ret1)

dict_new[‘name’]=‘爸爸’#键名存在，则对存在的键名对应的值进行修改

dict_new[‘name1’]=‘儿子’#键名不存在，则在原来的字典中增加该键值结构

print(dict_new)

#del与clear

list_new=[1,2,2,]

#删除指定元素

del list_new[0]

del dict_new[‘tel’]

#删除整个列表字典

del dict_new

del list_new

# print(list_new)

dict_new.clear()

print(dict_new)