Many thanks. Both the cases are OK. The only problem is that from: 12 22 21 In spite of writing 12 12 22 it writes 12 21 22 Do you know how is it possible to delete also this last trouble? Thanks a bunch, Nic
"Peter Otten" <[EMAIL PROTECTED]> ha scritto nel messaggio news:[EMAIL PROTECTED] > Nic wrote: > >> I tried to insert and execute the code, but the following error happens: >> >> Traceback (most recent call last): >> File "grafodna.py", line 10, in ? >> edges.sort(key = lambda u, v: (ddeg(u), ddeg(v))) >> TypeError: <lambda>() takes exactly 2 arguments (1 given) >> >> Do you know how is it possible to delete it? > > Note that > > lambda a, b: ... > > takes two arguments while > > lambda (a, b): ... > > takes one argument which must be a sequence (list, string, generator,...) > of > two items. > > So the above should probably be > > edges = list(G.edges()) > edges.sort(key=lambda (u, v): (ddeg[u], ddeg[v])) > for u, v in edges: > print ddeg[u], ddeg[v], > print > > > Here's how I would do it: > > edges = [(ddeg[u], ddeg[v]) for u, v in G.edges()] > edges.sort() > for a, b in edges: > print a, b, > print > > (all untested) > > Peter -- http://mail.python.org/mailman/listinfo/python-list