How to add an element to the list so that it does not repeat several times?

Question

Python

I'm writing a small password guessing program. The for loop checks for a password in the used_password_list and adds it if it's not there. Only there is one catch: the password is added as many times as in the list of elements, how to fix this? Can you use some alternative?

while y < 10:
  password_call = random_password()					
  for i in used_password_list:			
    if i != password_call:						
      used_password_list.append(password_call)	
  print (password_call)

Answer 1

Can you use some alternative?
https://docs.python.org/2/library/sets.html

Answer 2

There is another option:
book.pythontips.com/en/latest/for_-_else.html

while y < 10:
  password_call = random_password()					
  for i in used_password_list:			
    if i == password_call:
        break
  else:						
      used_password_list.append(password_call)	

  print (password_call)

Answer 3

Or use set

password = []
password.append(random_password())
set(password)
print(password)