當我使用input（）時，我的代碼在我運行時沒有出現

Question

我現在已經更改了我的代碼，但是在那裏說最後一行的語法無效，我該如何解決這個問題？我改變了最後一行的全球地位displayMenu之前，但它似乎是引起問題，以我的代碼

users = {} 
status = "" 

def displayMenu(): 
    status = raw_input("Are you a registered user? y/n? Press q to quit: ") 
    if status == "y": 
     oldUser() 
    elif status == "n": 
     newUser() 

def newUser(): 
    createLogin =("Create login name: ") 

    if createLogin in users: # check if login name exists 
     print ("\nLogin name already exist!\n") 
    else: 
     createPassw =("Create password: ") 
     users[createLogin] = createPassw # add login and password 
     print("\nUser created!\n")  

def oldUser(): 
    login = raw_input("Enter login name: ") 
    passw = raw_input("Enter password: ") 

    # check if user exists and login matches password 
    if login in users and users[login] == passw: 
     print ("\nLogin successful!\n") 
    else: 
     print ("\nUser doesn't exist or password error!\n") 

    if passw == users[login]: 
     print ("Login successful!\n") 

while status != "q":    
    global status displayMenu(): 

Answer 1

您有與該代碼的幾個問題。例如，

createLogin =("Create login name: ") 

只是將字符串"Create login name: "的名稱createLogin。但我懷疑，你想"Create login name: "爲用戶提示，所以你需要：

createLogin = raw_input("Create login name: ") 

腳本的最後一行並沒有太大的意義。我懷疑這是試圖使用global指令，但最好避免這種情況，除非你真的需要。而且一般你不需要真的需要它。 :)

這是您的代碼的修復版本。請注意，我們沒有將users字典保存到磁盤，因此當程序退出時，輸入的任何信息都將丟失。

from __future__ import print_function 

users = {} 

def displayMenu(): 
    status = raw_input("Are you a registered user? y/n? Press q to quit: ") 
    if status == "y": 
     oldUser() 
    elif status == "n": 
     newUser() 
    return status 

def newUser(): 
    createLogin = raw_input("Create login name: ") 
    if createLogin in users: # check if login name exists 
     print ("\nLogin name already exist!\n") 
    else: 
     createPassw = raw_input("Create password: ") 
     users[createLogin] = createPassw # add login and password 
     print("\nUser created!\n") 

def oldUser(): 
    login = raw_input("Enter login name: ") 
    passw = raw_input("Enter password: ") 

    # check if user exists and login matches password 
    if login in users and users[login] == passw: 
     print("\nLogin successful!\n") 
    else: 
     print("\nUser doesn't exist or password error!\n") 

status = "" 
while status != "q": 
    status = displayMenu()