Question

我正在使用Python 3.5为类进行用户名/密码程序，除了本节之外，一切都运行良好。该代码应该打开.txt文件（如果它不存在则创建一个），然后检查您输入的用户名是否已经在文件中。目前，它似乎正在读取一个空白列表（“[]”）并且基本上看不到要检查的内容，因此它接受用户名，尽管如果您在Windows文件浏览器中打开它，它仍然存在于文件中。

以下是用户名功能：

def registerNewUsername():
    checker = 0
    while(checker == 0):
        usernameInput = input("Please enter a username.\n")
        usernameInput.strip()
        usernameExists = False

        try:
            f = open("loginInfo.txt", "a+")
            userDataEntry = f.readlines()
            f.close()
        except:
            print("Something went wrong!")

        listLines = []
        for eachLine in listLines:
            entry = eachLine.split()
            keep = entry[0]
            listLines.append(keep)
        print(listLines)

        if(usernameInput in userDataEntry):
            print("This username already exists. Try again.\n")
            usernameExists = True
            checker = 0
        if("@" in usernameInput and ".edu" in usernameInput and usernameExists == False):
            print("\nUsername Accepted\n")
            checker = 1
       else:
            print("You need to include @ and .edu in your username. Try again.\n")
            checker = 0

    return usernameInput

以下是创建用户/密码列表的功能（在用户名和密码被批准后）：

def saveData(passwordInput, usernameInput):
    userDataEntry = usernameInput + " " + passwordInput + "\n"
    fileObject = open('loginInfo.txt', 'a')
    fileObject.write(userDataEntry)
    fileObject.close()

然而，登录功能肯定会读取列表并可以使用内部数据，所以这个函数中可能缺少某些东西吗？

def loginExisting():
    userDataEntry = open('loginInfo.txt', 'r')
    listLines = userDataEntry.readlines()
    userDataEntry.close()

    userDict = {}

    for eachLine in listLines:
        entry = eachLine.split()
        username = entry[0]
        password = entry[1]
        userDict[username] = password

    checker = 0
    while(checker == 0):
        print("\nYou've registered already? (OwO) Okay then!\n")
        usernameInput = input("Please enter your username:")
        passwordInput = input("Please enter your password:")


        if(usernameInput in userDict):
            if(userDict[usernameInput] == passwordInput):
                print("\nLogin successful!\nWelcome back,", usernameInput)
                checker = 1

            else:
                print("Password is incorrect. Try again.")
                checker = 0

        else:
            print("Username does not exist. Try again.")
            checker = 0

    nextStep = int(input("\nWould you like to:\n1.) Exit\n2.) Log out and return to menu\n\n"))
    if(nextStep == 1):
        print("\nGoodbye!")

    if(nextStep == 2):
        print("\nReturning to menu...\n")

        return nextStep

非常感谢任何帮助！

Answer 1

这可能是因为在registerNewUsername函数中，您运行usernameInput.strip()而未将其分配给任何内容。如果不将结果返回给变量或其他变量，则不会发生任何事情。尝试再次运行它，将usernameInput.strip()行更改为usernameInput = usernameInput.strip()。

尝试打开.txt文件并检查用户名是否存在

1 个答案: