Date2

#Author:Brill
data = {"Beijing":{
    "Chaoyang":{
        "Shahe":{},"Tiantongyuan":{}
    },"Haiding":{},"Changping":{}
},"Nanjing":{"Xinjiekou":{},"Muxuyuan":{}},"Shanghai":{}}

exit_flag = False

while not exit_flag:
    for i in data:
        print(i)

    choice = input("Please enter1 :")
    if choice in data:
        while not exit_flag:
            for i2 in data[choice]:
                print("	",i2)
            choice2 = input("Please enter2:")
            if choice2 in data[choice]:
                while not exit_flag:
                    for i3 in data[choice][choice2]:
                        print("		",i3)
                    choice3 = input("Please enter3:")
                    if choice3 in data[choice][choice2]:
                        for i4 in data[choice][choice2][choice3]:
                            print("		",i4)
                        choice4 = input("Please write B to back")
                        if choice4 == "B":
                            pass
                        elif choice4 =="Q":
                            exit_flag = True
                    if choice3 == "B":
                        break
                    elif choice3 == "Q":
                        exit_flag = True
            if choice2 == "B":
                break
            elif choice2 == "Q":
                exit_flag = True

#Author:Brill
data = {"Beijing":{
    "Chaoyang":{
        "Shahe":{},"Tiantongyuan":{}
    },"Haiding":{},"Changping":{}
},"Nanjing":{"Xinjiekou":{},"Muxuyuan":{}},"Shanghai":{}}

exit_flag = False

while not exit_flag:
    for i in data:
        print(i)

    choice = input("Please enter1 :")
    if choice in data:
        while not exit_flag:
            for i2 in data[choice]:
                print("	",i2)
            choice2 = input("Please enter2:")
            if choice2 in data[choice]:
                while not exit_flag:
                    for i3 in data[choice][choice2]:
                        print("		",i3)
                    choice3 = input("Please enter3:")
                    if choice3 in data[choice][choice2]:
                        for i4 in data[choice][choice2][choice3]:
                            print("		",i4)
                        choice4 = input("Please write B to back")
                        if choice4 == "B":
                            pass
                        elif choice4 =="Q":
                            exit_flag = True
                    if choice3 == "B":
                        break
                    elif choice3 == "Q":
                        exit_flag = True
            if choice2 == "B":
                break
            elif choice2 == "Q":
                exit_flag = True