At my previous post I would like to add a picture to give an idea of how I would like my new geometry produced by the intersection + buffering. The picture is the following:

<img src="http://osgeo-org.1560.x6.nabble.com/file/n5159108/Intersection_Buffering.png" border="0"/>

        
        
        
<br/><hr align="left" width="300" />
View this message in context: <a href="http://osgeo-org.1560.x6.nabble.com/Performing-buffering-with-script-in-PyQGIS-tp5159074p5159108.html">Re: Performing buffering with script in PyQGIS</a><br/>
Sent from the <a href="http://osgeo-org.1560.x6.nabble.com/Quantum-GIS-Developer-f4099106.html">Quantum GIS - Developer mailing list archive</a> at Nabble.com.<br/>