字典的增删改查使用1、增加

info = { "person1":"大s", "person2":"小s", "person3":"小3", "person4":"小4"}info["person5"]="小5"

info = { "广东" : { "深圳":["罗湖", "福田", "南山"], "广州":["天河", "番禺", "白云"], }, "浙江" : { "杭州":["西湖","下城","上城"], "温州":["龙湾","瑞安"], }, "江苏" : { "苏州":["沧浪","平江","吴中"], "南京":["白下","浦口","你好"], }}info["湖南"]={"长沙":[1,2,3]}#增加了一个key为湖南的内容2、删除

info = { "person1":"大s", "person2":"小s", "person3":"小3", "person4":"小4"#---------key----value------}del info["person4"]3、修改

info = { "person1":"大s", "person2":"小2", "person3":"小3", "person4":"小4"#---------key----value------}info["person1"] = "大1"

info = { "广东" : { "深圳":["罗湖", "福田", "南山"], "广州":["天河", "番禺", "白云"], }, "浙江" : { "杭州":["西湖","下城","上城"], "温州":["龙湾","瑞安"], }, "江苏" : { "苏州":["沧浪","平江","吴中"], "南京":["白下","浦口","你好"], }}info["江苏"]["南京"] = [1,2,3]print(info["江苏"]["南京"])#结果：[1,2,3]4、查询

info = { "person1":"大s", "person2":"小2", "person3":"小3", "person4":"小4"#---------key----value------}print(info.get("person1")) #此方法如果主键不存在，也不会报错print(info["person1"]) #此方法跟上面一样，但如果主键不存在，系统报错

info = { "广东" : { "深圳":["罗湖", "福田", "南山"], "广州":["天河", "番禺", "白云"], }, "浙江" : { "杭州":["西湖","下城","上城"], "温州":["龙湾","瑞安"], }, "江苏" : { "苏州":["沧浪","平江","吴中"], "南京":["白下","浦口","你好"], }}print(info["江苏"])#结果：{'苏州': ['沧浪', '平江', '吴中'], '南京': ['白下', '浦口', '你好']}print(info["江苏"]["苏州"])#结果：['沧浪', '平江', '吴中']5、字典for循环

info = { "广东" : { "深圳":["罗湖", "福田", "南山"], "广州":["天河", "番禺", "白云"], }, "浙江" : { "杭州":["西湖","下城","上城"], "温州":["龙湾","瑞安"], }, "江苏" : { "苏州":["沧浪","平江","吴中"], "南京":["白下","浦口","你好"], }}for i in info: print(i,info[i])#结果：广东 {'深圳': ['罗湖', '福田', '南山'], '广州': ['天河', '番禺', '白云']}浙江 {'杭州': ['西湖', '下城', '上城'], '温州': ['龙湾', '瑞安']}江苏 {'苏州': ['沧浪', '平江', '吴中'], '南京': ['白下', '浦口', '你好']}