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()
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.
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?
so what is the output of graphs.planar_graphs?
Asked: 6 years ago
Seen: 408 times
Last updated: May 24 '18
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