title: while loop input Yes/No (Python 3)
body: <p>This is the code :</p>
  
  <pre><code>quiz = str(input("would you like to answer some questions \n choose y/n"))
  
  quiz = quiz.lower()
  while quiz != 'y' or quiz != 'n':
      print("please choose 'y' or 'n'")
      input("y/n?")
  </code></pre>
  
  <p>This is part of my code I have tried using <code>str()</code> even without <code>or</code> operand it is not working btw I am using python <code>v3.7</code>.</p>
  
  <p>1) If you can please fix the code</p>
  
  <p>2) If you know some other code is more efficient tell</p>
  
  <p>Note: If the input is y. # for example
  error is <code>" ValueError: float: Argument: y is not a number "</code>  </p>