title: Rectangles from Points using Python
body: <p>I have a text file full of points. They are separated on each line by a comma-limited (x,y) pair. eg.</p>
  
  <pre><code>-43.1234,40.1234\n
  -43.1244,40.1244\n
  etc.
  </code></pre>
  
  <p>I now need to create a polygon around each of these points. The polygon has to have a 15 kilometer buffer from the point. I don't have access to ArcGIS or any other GIS that provides this functionality for me so at this point, I am wondering if anyone has the math that will help me get started?</p>