title: Swap 2 values of 2 variables without using a third variable; python
body: <p>So, a friend of mine asked how my python programming was coming; I said I was learning a lot and that it was coming along nicely. Then my friend, a math-snob, asks me: </p>
  
  <p><strong><em>"Can you swap the value of 2 variables without using a third variable as a temporary placeholder?"</em></strong></p>