List and order
Peter Otten
__peter__ at web.de
Mon May 15 15:03:09 CEST 2006
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
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