def signup():
    with open("C:\\Users\\Administrator\\Desktop\\賬號密碼.txt","r") as f:
        line=f.read()
        line=eval(line)
        flag=False
    while True:
        global username1
        username1 = input("輸入註冊賬號:")
        for i in line:
            if i["username"]==username1:
                
 
print("賬號已存在")
                break
        else:
            if username1[0].isalnum():
                if len(username1)  in range(5,12):
                    for i in range(1,len(username1)):
                        if (username1[i].isalnum()) or (username1[i]=="_"):
                            print
 
("賬號可以使用")
                            flag=True
                            break
                        else:
                            print("賬號由數字、字母、下劃線組成")
                            break
                else:
                    print("賬號由5到12位數字、字母、下劃線組成")
                    break
            else
 
:
                print("數字字母作為賬號首位")
                break
        if flag == True:
            break
    while True:
        password1=input("輸入註冊密碼:")
        password2 = input("再次輸入註冊密碼:")
        if password1 != password2:
            print("密碼不同")
        else:
            break
    submit=input("輸入1提交，輸入2取消")
    if int(submit)==1:
        data={}
        data["username"]=username1
        data["password"]=password1
        with open("C:\\Users\\Administrator\\Desktop\\賬號密碼.txt", "r") as f:
            line = f.readlines()
            list_=eval(line[0])
            list_.append(data)
        with open("C:\\Users\\Administrator\\Desktop\\賬號密碼.txt", "w") as f:
            f.write(str(list_))
    elif int(submit==2):
        exit(0)
def signin():
    print("請登錄")
    flag=True
    while True:
        a = input("輸入賬號:")
        with open("C:\\Users\\Administrator\\Desktop\\賬號密碼.txt","r") as f:
            line=f.read()
            line=eval(line)
        for i in line:
            if i["username"] == a:
                flag = False
                break
        if flag == False:
            break
        else:
            print("賬號不存在")

    b=input("輸入密碼:")
    c=int(input("輸入1提交"))
    if c==1:
        with open("C:\\Users\\Administrator\\Desktop\\賬號密碼.txt", "r") as f:
            line = f.read()
            line = eval(line)
            flag=True
            for i in line:
                if i["username"] == a and i["password"]==b:
                    print("已登錄")
                    flag=False
                    break
            if flag=="Ture":
                print("密碼錯誤")
    else:
        exit(0)
while True:
    choose=int(input("輸入1申請，輸入2登錄,輸入0退出"))
    if choose==1:
        signup()
        signin()
    if choose==2:
        signin()
    if choose==0:
        break

註冊登錄-簡易代碼