I've installed the qgis on ubuntu 12.04 following the instructions on http://hub.qgis.org/projects/quantum-gis/wiki/Download. I am trying to test the Python API and try to do the follwoing
from qgis.core import *
layer = QgsVectorLayer("coast.shp", "coast_shp", "ogr")
But layer.isValid() returns false. Any ideas why it might happen?
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