title: Clipping Line shapefiles within the extent of Polygon shape
body: <p>My question is an extension of <a href="https://stackoverflow.com/questions/25742903/vertical-lines-in-a-polygon-shapefile">Vertical lines in a polygon shapefile</a>. Kindly refer to that question first. </p>
  
  <p>What you shall see there is a method of generating vertical lines with respect to the bounding box, at user defined spacing. I understand that OGR, Fiona, Shapely etc. can be used to do the (next step of) clipping, but I am not able to understand their utilization.</p>
  
  <p>How do I read one the line and polygon shapefile? Every application that uses Shapely shows how to generate the LineString, Point or Polygon but never to read and <strong>existing shapefile</strong> </p>
  
  <p>Kindly assist me with at-least a skeleton structure so I can build on it. </p>