[Qgis-developer] Python: Union selected polygons in a layer

[Marco Bernasocchi]

Hi Andi in inasafe i do something similar [0]
Please be warned that it is in the "messyest" part of our code :)

Ciao

[0]
https://github.com/AIFDR/inasafe/blob/master/safe_qgis/impact_statistics/aggregator.py#L1046
Hi,

I am trying to union selected geometries in a layer into one geometry. A
multpolygon as a result would be fine if the selected polygons aren't
contiguous.

I did not find a union command in the API. How can I do this from Python?

Thanks a lot for any hints!

Andreas
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