Question

我正在尝试制作一个记事本程序，您需要先登录才能阅读之前做的笔记。

在注册过程中，用户名保存在“ Passwords.txt”上的密码“ Usernames.txt”上。要验证用户名是否与密码匹配，我要检查特定用户名所在的行与用户名所在的密码所在的行相同。

任何帮助将不胜感激。

Answer 1

您可以打开两个文件并同时进行迭代：

with open('username.txt') as users, open('password.txt') as passwds:
    for user, passwd in zip(users, passwds):
        # Check username/password here

但是，这不是一个很好的存储布局。如果您在读取或写入文件时遇到任何错误，则身份验证数据库可能会损坏，并且一个用户可能会以另一个用户的密码结尾。

最好将两个属性都存储在一个文件中。可以使用JSON甚至CSV，但是最好使用内置的sqlite3模块。

Answer 2

我不会在您的代码上发表评论，但我只会关注此方面：

我要检查某个用户名所在的行是否为与用户名附带的密码所在的行相同找到。

# Open the users file, read its content.
u = open("Usernames.txt","a+")
all_users = u.readlines()

# Compare each line with the username you are looking for.
user_to_find = "Sam"
line_where_user_was_found = None

for n,user in enumerate(all_users):
    if user == user_to_find:
        line_where_user_was_found = n
        break

# Open the passwords file, read its content.
p = open("Passwords.txt","a+")
all_passwords = p.readlines()

# Compare each lines with the password you are looking for.
password_to_find = "1234"
line_where_password_was_found = None

for m,password in enumerate(all_passwords):
    if password == password_to_find :
        line_where_password_was_found = m
        break

# Check if the username-password pair matches.
does_it_match = (line_where_user_was_found == line_where_password_was_found)

Answer 3

您可以将文件的行读入列表：

with open("Usernames.txt") as f:
    usernames = f.readlines()

您可以使用index获取特定字符串的行号：

ix = usernames.index(username)

您当然可以通过将密码文件读入另一个列表并查看passwords[ix]来获得该索引处的密码。

Answer 4

这应该为您带来想要的东西：

# Get login credentials from user and cast from unicode to string
username = str(raw_input("username:"))
password = str(raw_input("password:"))

# Get all valid usernames as a list and remove newlines from end
with open("Usernames.txt") as usernameFile:
    usernameList = [line.replace("\n", "") for line in usernameFile.readlines()]

# Get all valid passwords as a list and remove newlines from end
with open("Passwords.txt") as passwordFile:
    passwordList = [line.replace("\n", "") for line in passwordFile.readlines()]

# Figure out which lines the user's username and password are on
lineOfUsername = -2
lineOfPassword = -1
try:
    lineOfUsername = usernameList.index(username)
    lineOfPassword = passwordList.index(password)
# If either is not found, inform the user
except ValueError:
    print("Bad username or password")
    exit()

# If the lines match, then you got there!
if(lineOfUsername == lineOfPassword):
    # Your logic here
    print("Valid login")
# Otherwise, you didn't (womp, womp)
else:
    print("Bad username or password")

一些警告：

这对安全性来说太可怕了。如上所示，这不是安全解决方案。如果您想知道为什么，请在YouTube的电脑爱好者上查找相关主题。
如果用户名或密码都不正确，则不在此处说明。鉴于您提出的问题，真的不可能。

Answer 5

检查此代码：

DWORD

从.txt文件读取时如何检查两个字符串是否在同一行上

5 个答案: