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graphs.planar_graphs

asked 2018-05-24 00:10:38 +0200

standardtrickyness gravatar image

So I'm a bit confused by the documentation of graphs.planar_graphs I thought it would just generate a list of planar graphs so I don't know why the following code doesn't work (and also why I need to do list(l) )

l = graphs.planar_graphs(4, dual=False)
gen=list(l) #don't know why this is necessary k=len(gen) ii=1 G=gen[ii] p=G.plot() p.show()

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answered 2018-05-24 17:13:53 +0200

j.c. gravatar image

To check the type of l, you can type ?l. You will see that l is a generator, not a list object. Thus in order to compute its length (and do other list-specific operations) you must convert it to a list using list.

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Okay thanks I'll have to read up on what a generator is, but what is wrong after I do gen=list(l) G=gen[ii] p=G.plot p.show?

standardtrickyness gravatar imagestandardtrickyness ( 2018-05-24 20:41:00 +0200 )edit

so what is the output of graphs.planar_graphs?

standardtrickyness gravatar imagestandardtrickyness ( 2018-05-25 17:53:23 +0200 )edit

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Asked: 2018-05-24 00:10:38 +0200

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Last updated: May 24 '18