标签：one 个人 key value ems elf int 表示 val
user_info={"name":"wang","age":"26","gender":"man"}
#我们用键值对来表示
key：name,age,gender
value:wang,26,man
#清空字典
user_info={"name":"wang","age":"26","gender":"man"}
user_info.clear()
print(user_info)
#输出：{}
# 通过键获得值
user_info={"name":"wang","age":"26","gender":"man"}
str1= user_info.get("name")
print(str1)
#输出:wang
# 获得字典里面内容以列表表示
user_info={"name":"wang","age":"26","gender":"man"}
str1= user_info.items()
print(str1)
#输出：dict_items([(‘name‘, ‘wang‘), (‘gender‘, ‘man‘), (‘age‘, ‘26‘)])
#获得字典里面所有键值 列表表示
user_info={"name":"wang","age":"26","gender":"man"}
str1= user_info.keys()
print(str1)
#输出：dict_keys([‘name‘, ‘gender‘, ‘age‘])
#获得字典里面所有的键值表示
user_info={"name":"wang","age":"26","gender":"man"}
str1= user_info.values()
print(str1)
#输出：dict_values([‘26‘, ‘wang‘, ‘man‘])
#增加
user_info={"name":"wang","age":"26","gender":"man"}
user_info["salary"]="2000"
print(user_info)
#{‘name‘: ‘wang‘, ‘age‘: ‘26‘, ‘gender‘: ‘man‘, ‘salary‘: ‘2000‘}
#查找
user_info={"name":"wang","age":"26","gender":"man"}
print("age" in user_info.keys(）)
#输出：True
#删除
user_info={"name":"wang","age":"26","gender":"man"}
ret=user_info.pop("name")
print(ret)
#返回 wang 有放回值
dic={"k1":11,"k2":22,"k3":33}
del dic["k2"]
print(dic)
#输出{‘k1‘: 11, ‘k3‘: 33} 无返回值
#如果删除的key不在字典中那么就会报错
dic={"k1":11,"k2":22,"k3":33}
del dic["k5"]
print(dic)
#输出：KeyError: ‘k5‘
update(self, E=None, **F): 更新字典（个人感觉没什么卵用）
dic={"k1":11,"k2":22,"k3":33}
dic.update({"k1":11,"k2":22,"k3":33,"k4":55})
print(dic)
#输出：{‘k2‘: 22, ‘k4‘: 55, ‘k3‘: 33, ‘k1‘: 11}
标签：one 个人 key value ems elf int 表示 val
原文地址：http://www.cnblogs.com/ricemi/p/7905811.html
