Clip vector layer in QGIS and Python?

Question

I want to write a Python function to create a shapefile layer from clipping an input layer using a mask.

Does someone know the way how to do it?

Answer 1

import subprocess

subprocess.call(["ogr2ogr", "-f", "ESRI Shapefile", "-clipsrc", mymask, myresult, myinput], shell=True)

The my***s are all shapefiles.