BTW is there any pre-compiled for windows (Python 2.72) release of Fiona?

@om_henners Unfortunately only DXF and GDS files are importable!

However DXF file may have some issues since I could not open it by different software such as LibreCAD, SketchUp etc.

Thanks for introducing Fiona and also thanks for your interesting package Shapely. You are surely doing good job.

and I also had to replace () with [] in the produced GeoJSON file to bypass another error caused using ogr2ogr.exe. Those may be changes in software or I'm missing something obvious! Anyway, with these two tricks it produced a DXF file successfully.

Just to mention in execution of the provided code an error come up: "write requires string/buffer". So I changed it as: write(str(mapping(buffer_obj))) and it is OK now. I use Python 2.72 BTW.

Thanks a lot. You gave many ideas which are very useful. I would like to try OGR through Python. This a good answer.