title: Add tuple to list of tuples in Python
body: <p>I am new to python and don't know the best way to do this.</p>
  
  <p>I have a list of tuples which represent points and another list which represents offsets. I need a set of all the combinations that this forms.
  Here's some code:</p>
  
  <pre><code>offsets = [( 0, 0),( 0,-1),( 0, 1),( 1, 0),(-1, 0)]
  points = [( 1, 5),( 3, 3),( 8, 7)]
  </code></pre>
  
  <p>So my set of combined points should be</p>
  
  <pre><code>[( 1, 5),( 1, 4),( 1, 6),( 2, 5),( 0, 5),
   ( 3, 3),( 3, 2),( 3, 4),( 4, 3),( 2, 3),
   ( 8, 7),( 8, 6),( 8, 8),( 9, 7),( 7, 7)]
  </code></pre>
  
  <p>I'm not able to use NumPy or any other libraries.</p>