Question

我有用于记录用户的Python 3.5代码。

它会创建一个用户并将其记录下来。

在我终止程序并重新运行它之后，它不记得它创建的用户的详细信息。

如何将文件链接到文档？

Answer 1

本周早些时候，我正在做一个类似的项目，这就是我的目标！

import csv

def displayMenu():
    status = input("Are you a registered user? y/n? ")  
    if status == "y":
        login()
    elif status == "n":
        newUser()

def login():

    with open('users.txt') as csvfile:
        reader = csv.DictReader(csvfile)
        database = []
        for row in reader:
            database.append(dict(username=row['username'],
                                 password=row['password'],
                                 function=row['function']))

loggedin = False
while not loggedin:
    Username = input('Fill in your username: ')
    Password = input('Fill in your password: ')
    for row in database:
        Username_File = row['username']
        Password_File = row['password']
        Function_File = row['function']
        if (Username_File == Username and
            Password_File == Password and
                Function_File == 'user'):
            loggedin = True
            print('Succesfully logged in as ' + Username)
        elif (Username_File == Username and
              Password_File == Password and
                Function_File == 'admin'):
            loggedin = True
            print('Succesfully logged in as the admin.')
        if loggedin is not True:
            print ('Failed to sign in, wrong username or password.')

def newUser():
    signUp = False
    while not signUp:
        NewUsername = input("Create login name: ")
        NewUsername = str(NewUsername)
        with open('users.txt', 'r') as UserData:
                reader = csv.reader(UserData, delimiter=',')
        if (NewUsername) in open('users.txt').read():
            print ('Login name already exist!')

        else:
            NewPassword = input("Create password: ")
            NewPassword = str(NewPassword)
            with open('users.txt', 'a') as f:
                writer = csv.writer(f)
                UserPassFunction = (NewUsername,NewPassword,'user')
                writer.writerows([UserPassFunction])
            print("User created!")
            signUp = True






# ---- Main ---- #

displayMenu()

Answer 2

您可以读取和写入文件数据以存储用户登录详细信息，其中Logindetails.txt是存储在与程序相同位置的.txt文件。 Windows记事本使用.txt文件。

import linecache
with open("LoginDetails.txt", "r") as po:
    LoginDetails = linecache.getline('LoginDetails.txt', int(LineNumber)).strip()

＆＃34; R＆＃34;将以只读模式打开文件。＆＃34; R +＆＃34;将允许您读取和写入文件。

def replace_line(file_name, line_num, text):
    lines = open(file_name, 'r').readlines()
    lines[line_num] = text
    with open(file_name, 'w') as out:
        out.writelines(lines)

P.S我没有在这里创建这个原创帖子Editing specific line in text file in python

我建议使用SQL数据库来获取登录详细信息，如果您希望使用SQL，我建议您使用sqlite3库/模块

此外，您的计划可能无法记住我的详细信息＆＃39;因为您可能会将详细信息存储为由用户输入更改的变量，该变量存储在RAM中。程序关闭后会擦除此数据，因此如果通过用户输入更改了数据，则每次关闭程序时都必须重新更改输入。

您还可以扫描文件中的字符串，例如用户名。 Search for string in txt file Python

如何将文件链接到文档？

2 个答案: