我正在 python 中开发身份验证程序，但我遇到了数据库问题

Question

I am developing a login system but im having trouble with the user and password storage part. I made a list and i outsourced it to a text file and it writes everything in it but every time i run the program again it erases everything it stored previously. Here is the code i wrote until now. Anything else i am doing wrong, please let me know, i am happy to get a more skilled person's opinion on this.

done = True

while done == True:
    user = input('Create Username: ')

    from pwgen import genPass

    break

while done == True:    
    password = input('Create Password: ')
    done = False

    store_user = []
    store_pass = []

    store_userpass = []

    if user in store_user:
        print("That user already exists")
    else:
        store_user.append(user)
        store_pass.append(password)

        outF = open('user.txt', 'w')
        outf= open('pw.txt', 'w')

        for line in store_user:
            outF.write(line)
            outF.write('\n')

        for line1 in store_pass:
            outf.write(line1)
            outf.write('\n')

    outF.close()
    outf.close()

    done = False

while True:
    userguess=""
    passwordguess=""
    key=""
    while (userguess != user) and (passwordguess != password):
        userguess = input('User Name: ')
        passwordguess = input('Password: ')

        if userguess != user:
            print("Error: Unknown username.")
        if userguess == user and passwordguess != password:
            print("Error: Incorrect password. Try again.")
        if userguess != user and passwordguess != password:
            print("Error: Unknown user and password combination.")
        if userguess == user and passwordguess == password:
            print("Welcome,", user, ". Type lock to lock this user.")
    break

while key != "lock":
    key = input()

Answer 1

You open the files user.txt and pw.txt in write mode (the second parameter in the open function), which recreates the file each time, instead of append mode, which will allow you to append data to your files.

Try:

outF = open('user.txt', 'a')
outf= open('pw.txt', 'a')

instead of:

outF = open('user.txt', 'w')
outf= open('pw.txt', 'w')