Am 03.09.21 um 00:18 schrieb Gerion Entrup:
My question: How can I debug this and find out, why it is invalid? Can I 
do/print anything in Python? Should I use GDB? Where would be a good place to 
set a breakpoint?

I cannot print the faulty edge. It is fairly complicate to make an minimal 
example. My whole code uses no remove_edge() or remove_vertex(). I'm using 
graph_tool 2.43.

What you should do is produce a minimal example that shows the problem... No debugger is going to replace this simple strategy.

From the code fragment that you have shown, it's not possible to say much.

I notice that you are subclassing Graph, and probably omitting to us specializations that you are making to Graph.vertex() and other methods.

--
Tiago de Paula Peixoto <[email protected]>
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