dict是无序的 ，数据关联性强，键值对，唯一一个个映射的数据类型
字典的键必须是可哈希的数据类型 （字符串，数字，bool，元祖）并且是唯一的.
不可哈希的:（列表，字典）
dict的增
1:直接加键值对，如果和要增的相同就会覆盖，没有才添加
dic = {‘name‘:‘wujiang‘,‘age‘:18,}
dic[‘hobby‘] = ‘it‘
print(dic) #：{‘name‘: ‘wujiang‘, ‘age‘: 18, ‘hobby‘: ‘it‘}
2.setdefault（）有的键值对不变，没有的添加
dic = {‘name‘:‘wujiang‘,‘age‘:18,}
dic.setdefault(‘k1‘,‘v‘)
print(dic) #{‘name‘: ‘wujiang‘, ‘age‘: 18, ‘k1‘: ‘v‘}
dict的删
1.pop按照键去删，有返回值
dic = {‘name‘:‘wujiang‘,‘age‘:18,}
dic.pop(‘name‘)
print(dic) #：{‘age‘: 18}
2.del 直接删键
dic = {‘name‘:‘wujiang‘,‘age‘:18,}
del dic[‘age‘] #注意格式
print(dic) #：{‘name‘: ‘wujiang‘}
3.clear 清空列表
dic = {‘name‘:‘wujiang‘,‘age‘:18,}
dic.clear()
print(dic) #{}
dict的改：
1.直接改键
dic = {‘name‘:‘wujiang‘,‘age‘:18,}
dic[‘name‘] = ‘taibai‘
print(dic) #：{‘name‘: ‘taibai‘, ‘age‘: 18}
2.update 更新原dic（就是添加并覆盖）
dic = {‘name‘:‘wujiang‘,‘age‘:18,‘hobby‘:‘lol‘}
dic.update( {‘name‘:‘taibai‘})
print(dic) #：{‘name‘: ‘taibai‘, ‘age‘: 18, ‘hobby‘: ‘lol‘}
# ：只变原字典
dict的查
1.直接查键
dic = {‘name‘:‘wujiang‘,‘age‘:18,‘hobby‘:‘lol‘}
dic1 = dic[‘hobby‘]
print(dic1) #：lol
2.get 查键，没有返回None
dic = {‘name‘:‘wujiang‘,‘age‘:18,‘hobby‘:‘lol‘}
dic1 = (dic.get(‘jop‘))
print(dic1) #：None
dic的特殊类型：keys(键),values（值）,items（键值对）,
dic = {‘name‘:‘wujiang‘,‘age‘:18,‘hobby‘:‘lol‘}
dic1 = dic.keys()
print(dic1) #：dict_keys([‘name‘, ‘age‘, ‘hobby‘])
dic = {‘name‘:‘wujiang‘,‘age‘:18,‘hobby‘:‘lol‘}
dic1 = dic.values()
print(dic1) #：dict_values([‘wujiang‘, 18, ‘lol‘])
dic = {‘name‘:‘wujiang‘,‘age‘:18,‘hobby‘:‘lol‘}
dic1 = dic.items()
print(dic1)
#：dict_items([(‘name‘, ‘wujiang‘), (‘age‘, 18), (‘hobby‘, ‘lol‘)])
原文：http://www.cnblogs.com/j6852/p/7749945.html