如何使用外部文本文件创建身份验证

Question

作为一个更大程序的一部分，我需要根据外部 txt 文件检查某人的用户名和密码。

我需要在我的文本文件中使用字典吗？

username = input("What is your username?")
password = input("Password?")

#To do: check username + password against external file users.txt
#users.txt is in the same directory as the program

Answer 1

好吧，如果您的密码没有加密，您可以直接读取文件，并将其拆分以在字典中包含不同的用户和密码。

例如，如果您的文件格式为每行一个用户和一个密码，由 space 分隔，您可以使用这样的程序：

username = "username"
password = "password"

with open("users.txt", "r") as passwordsfile:
    passwordSeparator = " "
    # One line format, you can use one of the following solutions
    passwords = {
        x.split(passwordSeparator)[0]: x.split(passwordSeparator)[
            1
        ]  # x should be in "username password" format, so we have to split it
        for x in filter(
            None, passwordsfile.read().split("\n")
        )  # The filter function remove the empty lines
    }

    # Multiline solution:
    passwords = {}
    separatedLines = filter(None, passwordsfile.read().split("\n"))
    for x in separatedLines:
        _username = x.split(passwordSeparator)[0]
        _password = x.split(passwordSeparator)[1]
        passwords[_username] = _password


# print(passwords) : {"user1": "password1", "user2": "password2"}

# Check the user and password with assert
try:
    assert (
        passwords[username] == password
    )  # assert is useful to check a condition in our program. This is useful in a try/except bracket, because in this case, we have no guarentee that the username is in the password database
    print("You're logged in")
except:
    print("Wrong password or username!")

但是，如果您有一个大型用户数据库，您应该查看数据库存储（SQLite、MySQL、...）以提高性能，并且您可能需要加密您的用户密码。

Answer 2

无论我从你的问题中得到什么，你都想创建一个 login/Authentication 从文本文件中调用信息的程序，

def main():    
username, password = get_name_and_password()  
registered_users = read_pwdfile('pwd_filename')  
if usr_pass_registered(username, password, registered_users):  
    registered = True  
else:  
    registered = get_registration(username, password, 'pwd_filename')  
if registered:  
    print(You are logged in)

#您需要以csv格式保存您的用户名和密码（逗号分隔）

如何使用外部文本文件创建身份验证

How to create authentication using an external text file

python

authentication

login

text-files