字典操作
a.增加
1 >>> info["stu1104"] = "abc" 2 >>> info 3 {'stu1102': 'x5456', 'stu1104': 'abc', 'stu1103': 'Mali', 'stu1101': 'Wu'}
b.修改
1 >>> info['stu1101'] = "xinge" 2 >>> info 3 {'stu1102': 'x5456', 'stu1103': Mali', 'stu1101': 'xinge'}
c.删除
1 >>> info 2 {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya', 'stu1101': '武藤兰'} 3 >>> info.pop("stu1101") #标准删除姿势 4 '武藤兰' 5 >>> info 6 {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'} 7 >>> del info['stu1103'] #换个姿势删除 8 >>> info 9 {'stu1102': 'LongZe Luola'} 10 >>> 11 >>> 12 >>> 13 >>> info = {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'} 14 >>> info 15 {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'} #随机删除 16 >>> info.popitem() 17 ('stu1102', 'LongZe Luola') 18 >>> info 19 {'stu1103': 'XiaoZe Maliya'}
d.查找
1 >>> info = {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'} 2 >>> 3 >>> "stu1102" in info #标准用法 4 True 5 >>> info.get("stu1102") #获取 6 'LongZe Luola' 7 >>> info["stu1102"] #同上，但是看下面 8 'LongZe Luola' 9 >>> info["stu1105"] #如果一个key不存在，就报错，get不会，不存在只返回None 10 Traceback (most recent call last): 11 File "<stdin>", line 1, in <module> 12 KeyError: 'stu1105'
e.获取键值
1 #values 2 >>> info.values() 3 dict_values(['LongZe Luola', 'XiaoZe Maliya']) 4 5 #keys 6 >>> info.keys() 7 dict_keys(['stu1102', 'stu1103'])
f.合并
1 #update 2 >>> info 3 {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya', 'stu1106': 'Alex'} 4 >>> b = {1:2,3:4, "stu1102":"龙泽萝拉"} 5 >>> info.update(b) 6 >>> info 7 {'stu1102': '龙泽萝拉', 1: 2, 3: 4, 'stu1103': 'XiaoZe Maliya', 'stu1106': 'Alex'}
g.深copy
1 import copy 2 3 n1 = {"k1": "wu", "k2": 123, "k3": ["alex", 456]} 4 5 n4 = copy.deepcopy(n1)
h.循环
1 #方法1 2 for key in info: 3 print(key,info[key]) 4 5 #方法2 6 for k,v in info.items(): #会先把dict转成list,数据里大时莫用 7 print(k,v)