account = 'user'
password1 = 'pass'

while True:
   print('Please provide user name: ')
   username = input()
   if username == account:
      for t in range(3):
         print('Welcome ' + account + '  Please provide your password: ')
         password = input()
         if password == password1:
            print('Welcome ' + account)
            break
         else:
            print('Incorrect password.' + ' This is your ' + str(t + 1) + ' try.')
            if t == 3:
              print('You have entered an incorrect password for ' + account + ' You are logged out.')
              break
   else:
      print('User does not exist.')
   break