[igraph] returning a graph object

[Marco]

Dear list,

i have a function in my python code, let's call it evolve(), that
takes a graph as argument and returns a graph.
Basically it is be something like:

def evolve(graph,a)
      ...do something a times....
      return graph


I use it in my code as:

graph=igraph.Graph.Erdos_Renyi(cool parameters here)
graph=evolve(graph)

Fact is, this code doesn't work.

If i keep the code of the function evolve in __main__, it works flawlessy.

Ideas on why?

thanks in advance,

marco

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