Question

我正在尝试创建一个登录程序，将用户的输入凭据与存储在文本文件中的凭据进行比较我该如何正确地做到这一点？

这是我到目前为止所做的：

file = open("logindata.txt", "r")   
data_list = file.readlines()   
file.close()   
print(data_list)   


for i in range(0, len(data_list)):   
        username = input("username: ")           
        password = input("password: ")      
        i += 1  
        if i % 2 == 0:   
            if data_list[i] == username and data_list[i + 1] == password:   
            print("You are successfully logged in as", username)  
            i == len(data_list)  
        elif data_list[i] == username and data_list[i + 1] != password:   
            print("The password you entered was incorrect, please try again.")    
        else:   # how do i end the code if the user inputs no
            if data_list[i] != username:   
                choice = input("The username you entered was not found, would you like to create an account? (Y/N)")   
                if choice.upper() == "Y":    
                    new_username = input("new username: ")    
                    data_list.append(new_username + "\n")     
                    new_password = input("new password: ")     
                    data_list.append(new_password + "\n")    
                    file = open("logindata.txt", "w")    
                    file.writelines(data_list)    
                    i == data_list

这是凭证文本文件的设置方式：

user1
pass1
user2
pass2

Answer 1

我想你想要这样的东西：

def does_username_exists(username, login_file_path):
  username_exists = False
  user_password = None
  with open(login_file_path) as login_file:
    while True:
      username_line = login_file.readline()
      if not username_line: break
      password_line = login_file.readline()
      if not password_line: break
      if username == username_line.strip():
        username_exists = True
        user_password = password_line.strip()
        break

  return username_exists, user_password


def main():
  login_file_path = "logindata.txt"

  username = input("Enter username: ")
  username_exists, user_password = does_username_exists(username, login_file_path)
  if not username_exists:
    choice = input("The username you entered was not found, would you like to create an account? (Y/N)")
    if choice.upper() == 'Y':
      new_username = input("Enter new username: ")
      new_password = input("Enter new password: ")
      with open(login_file_path, "a") as login_file:
        login_file.write(new_username + "\n")
        login_file.write(new_password + "\n")
    return

  password = input("Enter password: ")
  if not (password == user_password):
    print("The password you entered was incorrect, please try again.")
  else:
    print("You are successfully logged in as - '{}'".format(username))


if __name__ == "__main__":
  main()

创建程序以模拟登录功能

1 个答案: