title: Understanding logic in python (Exercise 27 of Learn Python the Hard Way)
body: <p>Could someone explain exercise 27 of learn python the hard way to me?</p>
  
  <p>Here is an image showing the section i don't understand.
  <img src="https://imgur.com/hav8b.png" alt="alt text"></p>
  
  <p>Is it saying that assuming the left column of the table is true, is the answer true?</p>
  
  <p>eg if x = y is not false, is x=y true? yes.</p>
  
  <p>but then.. if x = y is false and true, is x=y true? no??</p>