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()
