title: PostGIS ST_intersects python equivalent
body: <p>I currently use PostGIS as a backbone for a lot of spatial functions I perform in python scripts. Specifically taking several shapefile geometries and seeing if they intersect, and then sorting them into seperate directories. I upload the shapefiles using shp2pgsql and then correlate them using ST_Intersects and then sort them using os/shutil functions in the script.   </p>
  
  <p>My problem is one of our teams works only on government networks and cannot get postgres/postGIS approved by their system admins. Is there a python module/function out there that performs the same correlation of geometries as ST_Intersects without the need of postgres? Or if I need to write this myself, is there a site for algorithms pertaining to geometries. For example if I have an upper left and a lower right coordinate, how can I compute the other two points. I'm not asking for anyone to write code for me, just some help being pointed in the right direction. </p>
  
  <p>Also all datums performed in WGS 1984</p>