title: selecting numbers from a list in python
body: <p>I am working on a program that generates a single elimination tournament. so far my code looks like this ( i have just started)</p>
  
  <pre><code>amount = int(raw_input("How many teams are playing in this tournament?  "))
  teams = []
  i = 0
  while i&lt;amount:
      teams.append(raw_input("please enter team name:  "))
      i= i+1
  </code></pre>
  
  <p>now i am stuck. I want to randomly pick 2 numbers that will select the teams facing eachother. the numbers cannot repeat at all, and have to range from 1 to "amount". What is the most efficient way to do this? </p>