ogr.Geometry __init__ method not functionnal with some attributes

[dpinte@…]

__init__ methods cannot return anything else than None in Python. If trying to return something else, it raises a TypeError.

When using ogr.Geometry constructor with wkt, wkb or gml parameters, the class cannot be used.

For example : 
org.py - line 1019 

       elif wkt:
            if srs:
                return CreateGeometryFromWkt(wkt, srs)
            else:
                return CreateGeometryFromWkt(wkt)

This causes the following error while trying to use ogr.Geometry(wkt=mywkt): 

======================================================================
ERROR: testpoly (__main__.TestIntrusionPoly)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "alert/test/testoutflow.py", line 125, in testpoly
    polylist = poly.create_polygons()
  File "/home/did/Documents/ucl/alert/python/alert/data/intrusion.py", line 460, in create_polygons
    coast_poly      = geometry.create_ogrgeom(ccorners, srs)
  File "/home/did/Documents/ucl/alert/python/alert/gis/geometry.py", line 71, in create_ogrgeom
    poly = ogr.Geometry(wkt=wktpoly)
TypeError: __init__() should return None

You should consider to rewrite this part of the code :
ogr.py - line 1019 :
        elif wkt:
            if srs:
                self._o = CreateGeometryFromWkt(wkt, srs)
                self.thisown = 1
            else:
                self._o = CreateGeometryFromWkt(wkt)
                self.thisown = 1


I'll make and send a patch in the next minutes.

Cheers,

Didrik

[dpinte@…]

Proposed patch