跟着老师的，教程 重新敲了一遍代码

 

# Author:XFdata={    "上海":{        "浦东新区":{            "金桥":{                "爱法新城":{},                "文峰广场":{},                "金桥电脑城":{}            }        },        "杨浦区":{            "五角场":{                "个人电脑":{},                "颐高数码":{}            }        }    },    "新疆":{        "巴州":{            "库尔勒":{                "塔里木":{},                "尉犁县":{},                "若羌":{}            }        },        "生产建设兵团":{            "农二师":{                "32团":{},                "33团":{}            }        }    }}exit_flag=Falsewhile not exit_flag:    for s1 in data:        print(s1)    select1=input("请选择:")    if select1 in data:        while not exit_flag:            for s2 in data[select1]:                print("\t", s2)            select2 = input("请选择:")            if select2 in data[select1]:                while not exit_flag:                    for s3 in data[select1][select2]:                        print("\t\t", s3)                    select3 = input("请选择:")                    if select3 in data[select1][select2]:                        for s4 in data[select1][select2][select3]:                            print(s4)                        select4 = input("程序已经到了最后一层")                        if select4 == "b":                            pass                        if select4=="q":                            exit_flag=True                    if select3=="b":                        break                    if select3 == "q":                        exit_flag = True            if select2=="b":                break            if select2 == "q":                exit_flag = True    if select1 == "q":        exit_flag = True