I'm trying write some code that checks if specific text, the login details in my case, is in a-CodePudding

//this asked a fresh user for log in details and then appends it to the file

while choice == '1':
 username = input('enter a name: ')
 if username == '':
  print ('user name cant be blank')
 else:
  print ('hello', username,'welcome to the quiz')
  password = input('please enter a password that is 4 characters long: ')
   while (len(password)) < 4:
    password = input('please enter a password that is 4 characters long: ')
   else:
    f = open("logininfo", "a")
    f.write('---------' '\n')
    f.write(username '\n')
    f.write(password '\n')
    f.write('---------' '\n')
    f.close()
    print('welcome you may now begin')
    choice=choice choice choice

//this is for when a user wants to log in and the system checks in the file for already inputted data

while choice == '2':
 print ('enter your log in details')
 username = input('username:')
 password = input('password:')
 if username in logininfo:
  print ("That user already exsist")
 else:  
   f = open('logininfo','r')
   if username in ('logininfo'):
    print('welcome')
   else:
    print ('no entry')

CodePudding user response：

Try like this:

with open("logininfo", "r") as f:
    all_text = f.read()

Now find the username in the variable string 'all_text' with if statement