python - 如何检查文本文件中的用户名和密码

Question

我正在编写一个程序，需要用户注册并使用帐户登录。我让程序让用户输入用户名和密码，并将其保存在外部文本文件(accountfile.txt)中，但是当涉及到登录时，我不知道如何让程序检查用户输入的内容存在于文本文件中。

这就是我的代码:

def main():
    register()

def register():
    username = input("Please input the first 2 letters of your first name and your birth year ")
    password = input("Please input your desired password ")
    file = open("accountfile.txt","a")
    file.write(username)
    file.write(" ")
    file.write(password)
    file.close()
    login()

def login():
    check = open("accountfile.txt","r")
    username = input("Please enter your username")
    password = input("Please enter your password")

从现在起我不知道该怎么办。

此外，这是注册帐户在文本文件中的样子:

Ha2001 examplepassword

Answer 1

打开文件后，您可以使用readlines()将文本读入用户名/密码对列表中。由于您用空格分隔用户名和密码，因此每一对都是类似于 'Na19XX myPassword' 的字符串，您可以使用 split() 将其拆分为两个字符串的列表。从那里检查用户名和密码是否与用户输入匹配。如果随着 TXT 文件的增长您希望有多个用户，则需要在每个用户名/密码对后添加换行符。

def register():
    username = input("Please input the first 2 letters of your first name and your birth year ")
    password = input("Please input your desired password ")
    file = open("accountfile.txt","a")
    file.write(username)
    file.write(" ")
    file.write(password)
    file.write("\n")
    file.close()
    if login():
        print("You are now logged in...")
    else:
        print("You aren't logged in!")

def login():
    username = input("Please enter your username")
    password = input("Please enter your password")  
    for line in open("accountfile.txt","r").readlines(): # Read the lines
        login_info = line.split() # Split on the space, and store the results in a list of two strings
        if username == login_info[0] and password == login_info[1]:
            print("Correct credentials!")
            return True
    print("Incorrect credentials.")
    return False