Question

我正在尝试创建一个程序，用户可以在其中添加用户名和密码到文本文件，然后删除文本文件中的用户名和密码。目前我不知道如何删除一行代码并保留相同的文本文件，删除它的唯一方法是让用户输入他们想要删除的用户名，然后删除密码和用户名。到目前为止我的代码:(在此代码中，我已经使用户名和密码检查功能正常工作。）感谢您的帮助：）

import re
def UsernameChecking():
    print("\nYour Username must have no blank spaces and must be less than 20 characters long")
    ab = False
    while not (ab):
        global Username
        Username = input("Please enter what you would like your username to be:\n")
        if len(Username) > 20:
            print("You username must be under 20 characters long") 
        elif re.search('[ ]',Username):
            print("There is not allowed to be any blank spaces in your username")
        else:
            print("Your username has been accepted!")
            ab = True 
def PasswordChecking():
    print("\nYour password must be at least 6 characters. \nIt also must be 12 or less characters")
    ac = False 
    while not (ac):
        global Password 
        Password = input("Please enter what you would like your password to be:\n")
        if len(Password) < 6:
            print("Your password must be 6 or more characters long")
        elif len(Password) > 12:
            print("Your password must be 12 or less characters long")
        else:
            print("Your password has been accepted!")
            ac = True

def CreateFile():
    f = open("UsernameDatabase.txt","w")
    f.close()

def AddingData():
    f = open("UsernameDatabase.txt", "a")
    f.write("\n\nUsername:" + (Username))
    f.write("\nPassword:" + (Password))
    f.close()#closes the file

def DeletingData():
    DeleteRequest = input("What Username and password would you like to delete. PLease enter the username:\n")
    f = open("UsernameDatabase.txt", "r+")

def RunningProgram():
    zz = False
    while not (zz):
        Q = input("Do you want to add a username and password to the file?\n")
        if Q == "Y":
            UsernameChecking()
            PasswordChecking()
            AddingData()
        else:
            zz = True

RunningProgram()
DeletingData()

Answer 1

从文件中删除用户名和密码：

data = [i.strip("\n").split(":") for i in open("UsernameDatabase.txt")]

user_name_to_delete = "something"

password_to_delete = "something"

f = open('UsernameDatabase.txt', 'w')
for entry in data:
    if entry[-1] != user_name_to_delete or entry[-1] != password_to_delete:
        f.write(':'.join(entry)+'\n')

f.close()

在文本文件中找到特定字符串然后删除

1 个答案: