如何编辑变量的值以供以后使用？(How to edit a variable's value for later use? [duplicate])

 
 
 这个问题在这里已有答案： 
 
 
 
  
 在Python 10答案中 使用“global”关键字 
 
 
 
 
 所以我正在设置一个密码管理员以获得乐趣（不打算用于除自学之外的其他任何事情），我希望用户能够编辑他们的用户名和密码。 
 
 我设置它的方式是它要求你输入用户名和密码，它会根据几个非常具体的值检查你的响应（第74行），如果语句为真，它将允许访问，如果不是，它会拒绝访问。 
 
 然后我尝试设置语句“if（yourUser == yourNewUser and yourPass == yourNewPass）：”当我尝试登录时，它给了我一个变量未定义的错误。 
 
 所以我尝试在早期定义变量，将每个变量设置为0，这样如果密码不变，它将转到常规位，如果它们已被更改或者如果它们不等于0，它将转到不同的功能做同样的事情，它有点工作，但后来拒绝我访问... 
 
 我不知道下一步该尝试什么。 如果您需要对我说的任何内容进行任何澄清，请询问，我会尽力提供帮助。 
 
 这是我的代码： 
 
#The goodbye or end statement
def goodbye():
    print('Good Bye! :{D')
#The main password request statement
def request():
    reqPass = input('Which password would you like?[Google, Twitter, Reddit, Computer]')
    #still need to figure out dictionary manipulation so this is a temporary sytem.
    if(reqPass == 'Google' or reqPass == 'google'):
        print('________________')
        print('Pass: GOOGLEPASSHERE')
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    elif(reqPass == 'twitter' or reqPass == 'Twitter'):
        print('_________________')
        print('User: TWITTERUSERHERE')
        print('Pass: TWITTERPASSHERE')
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    elif(reqPass == 'computer' or reqPass == 'Computer'):
        print('________________')
        print('Pass: COMPUTERPASSHERE')
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    elif(reqPass == 'reddit' or reqPass == 'Reddit'):
        print('_________________________')
        print('User: REDDITUSERHERE')
        print('Pass: REDDITPASSHERE')       
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    #This is the start of the changed password function     
def changedpass():
    if(yourUser == yourNewUser and yourPass == yourNewPass):
        dirCheck = input('Account settings?[y,n]')
        if(dirCheck == 'y' or dirCheck == 'Y'):
            #This is the start of the password/username thing
            print('this function is not working yet!')
            actSetCheck = input('Change username or password?')
            if(actSetCheck == 'user' or actSetCheck == 'User' or actSetCheck == 'Username' or actSetCheck == 'username'):
                yourNewUser = input('What would you like your new username to be?')
            elif(actSetCheck == 'pass' or actSetCheck == 'Pass' or actSetCheck == 'password' or actSetCheck == 'Password'):
                yourNewPass = input('What would you like your new password to be?')
        elif(dirCheck == 'n' or dirCheck == 'N'):
            request()

#setting the variables early on
yourNewUser == 0
yourNewPass == 0
#This is the "title screen"    
print('_____This is a password keeper_____')
#checking if the user has an account
actCheck = input('Do you already have an account?')
if(actCheck == 'Yes' or actCheck == 'yes'):
    #Checking to see if the yourNewUser or yourNewPass variable has been changed
    if(yourNewUser != '0' or yourNewPass != '0'):
        changedpass()
    #asking for user's name and password
    else:
        yourUser = input('___What is your Username?___')
        yourPass = input('___What is your Password?___')
        if(yourUser == 'ari' and yourPass == 'rycbar1234'):
            dirCheck = input('Account settings?[y,n]')
            if(dirCheck == 'y' or dirCheck == 'Y'):
                #This is the start of the change password/username thing
                print('this function is not working yet!')
                actSetCheck = input('Change username or password?')
                if(actSetCheck == 'user' or actSetCheck == 'User' or actSetCheck == 'Username' or actSetCheck == 'username'):
                    yourNewUser = input('What would you like your new username to be?')
                elif(actSetCheck == 'pass' or actSetCheck == 'Pass' or actSetCheck == 'password' or actSetCheck == 'Password'):
                    yourNewPass = input('What would you like your new password to be?')
            elif(dirCheck == 'n' or dirCheck == 'N'):
                request()
        #incorrect password thing
        else:
            print('Incorrect Username or password')

 
 
This question already has an answer here:
 
 
 
  
 Use of “global” keyword in Python  11 answers  
 
 
 
 
So i'm making a password keeper for fun(not intended to be used for anything other than teaching myself), and I want the user to be able to edit their username and password. 
 
The way I had it set up is it asks you for a username and password, it checks your responses against a couple of very specific values(line 74), if the statement was true, it would allow access and if it isn't, it would deny access. 
 
I then tried to set the statement "if(yourUser == yourNewUser and yourPass == yourNewPass):" it gives me a variable undefined error when I try to log in which I sort of expected.
 
So I tried defining the variables early on, setting each of them as 0 so if the password is unchanged, it would go to the regular bit, and if they have been changed or if they don't equal 0, it would go to a different function that does the same thing and it sort of worked, but then denied me access...
 
I don't know what to try next. If you need any clarification on anything that I said, just ask and I'll try to help.
 
Here's my code:
 
#The goodbye or end statement
def goodbye():
    print('Good Bye! :{D')
#The main password request statement
def request():
    reqPass = input('Which password would you like?[Google, Twitter, Reddit, Computer]')
    #still need to figure out dictionary manipulation so this is a temporary sytem.
    if(reqPass == 'Google' or reqPass == 'google'):
        print('________________')
        print('Pass: GOOGLEPASSHERE')
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    elif(reqPass == 'twitter' or reqPass == 'Twitter'):
        print('_________________')
        print('User: TWITTERUSERHERE')
        print('Pass: TWITTERPASSHERE')
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    elif(reqPass == 'computer' or reqPass == 'Computer'):
        print('________________')
        print('Pass: COMPUTERPASSHERE')
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    elif(reqPass == 'reddit' or reqPass == 'Reddit'):
        print('_________________________')
        print('User: REDDITUSERHERE')
        print('Pass: REDDITPASSHERE')       
        print('________________')
        reqSecPass = input('Request another password?[y/n]')
        if(reqSecPass == 'y' or reqSecPass == 'Y'):
            request()
        else:
            goodbye()
    #This is the start of the changed password function     
def changedpass():
    if(yourUser == yourNewUser and yourPass == yourNewPass):
        dirCheck = input('Account settings?[y,n]')
        if(dirCheck == 'y' or dirCheck == 'Y'):
            #This is the start of the password/username thing
            print('this function is not working yet!')
            actSetCheck = input('Change username or password?')
            if(actSetCheck == 'user' or actSetCheck == 'User' or actSetCheck == 'Username' or actSetCheck == 'username'):
                yourNewUser = input('What would you like your new username to be?')
            elif(actSetCheck == 'pass' or actSetCheck == 'Pass' or actSetCheck == 'password' or actSetCheck == 'Password'):
                yourNewPass = input('What would you like your new password to be?')
        elif(dirCheck == 'n' or dirCheck == 'N'):
            request()

#setting the variables early on
yourNewUser == 0
yourNewPass == 0
#This is the "title screen"    
print('_____This is a password keeper_____')
#checking if the user has an account
actCheck = input('Do you already have an account?')
if(actCheck == 'Yes' or actCheck == 'yes'):
    #Checking to see if the yourNewUser or yourNewPass variable has been changed
    if(yourNewUser != '0' or yourNewPass != '0'):
        changedpass()
    #asking for user's name and password
    else:
        yourUser = input('___What is your Username?___')
        yourPass = input('___What is your Password?___')
        if(yourUser == 'ari' and yourPass == 'rycbar1234'):
            dirCheck = input('Account settings?[y,n]')
            if(dirCheck == 'y' or dirCheck == 'Y'):
                #This is the start of the change password/username thing
                print('this function is not working yet!')
                actSetCheck = input('Change username or password?')
                if(actSetCheck == 'user' or actSetCheck == 'User' or actSetCheck == 'Username' or actSetCheck == 'username'):
                    yourNewUser = input('What would you like your new username to be?')
                elif(actSetCheck == 'pass' or actSetCheck == 'Pass' or actSetCheck == 'password' or actSetCheck == 'Password'):
                    yourNewPass = input('What would you like your new password to be?')
            elif(dirCheck == 'n' or dirCheck == 'N'):
                request()
        #incorrect password thing
        else:
            print('Incorrect Username or password')

原文：https://stackoverflow.com/questions/36414693