Hi,

While working on a recent project I ran into a problem in doing  
anything with the .centroid.coords of an geometry. I can get the  
coords object, but if I try to index, iterate, or do much of anything  
else, I get major errors.

If running as a script, I get

pure virtual method called
terminate called without an active exception
Abort trap

If running in an interactive session, I get a segmentation fault.

This happens with GEOS 3.0.0 or 2.2.3.

I've found a workaround (actually, a much better way of doing what I  
want to) in this case, and there's always .centroid.x and .centroid.y,  
which both work fine, but this seemed to be a bug.

Shapely is an excellent library, and it has greatly simplified several  
of my recent projects.

Thanks,
Russell
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