Simple QGIS geocoder

qgis_geocoder.py

import geocoder
g = geocoder.google("[% "__MYADDRESSFIELD__" %]".replace("'", r"\'"))
if not g.latlng:
  print "adress not found"
else:
  pt = QgsPoint(g.latlng[1],g.latlng[0])
  tr = QgsCoordinateTransform( QgsCoordinateReferenceSystem( 4326 , QgsCoordinateReferenceSystem.EpsgCrsId ),
                               QgsCoordinateReferenceSystem( __MYEPSG__, QgsCoordinateReferenceSystem.EpsgCrsId ))
  pt = tr.transform( pt )
  print pt.x(), pt.y()
  layer = QgsMapLayerRegistry.instance().mapLayer("__MYLAYERID__")
  if not layer or not layer.isEditable():
    print "layer not found or not editable"
  else:
    layer.changeGeometry([% $id %], QgsGeometry.fromPoint(pt))
    layer.updateExtents()
    layer.setCacheImage(None)
    layer.triggerRepaint()

This code allows you to define a layer action to set the geometry (point) based on an address field using Google geocoder.

1. Install geocoder: pip install geocoder
2. replace MYADDRESSFIELD, MYEPSG and MYLAYERID in the code
3. paste this to actions of the desired layer (as a Python action)
4. run action "GeoCode" for a feature