os.path.walk arg

[Steven Taschuk]

Quoth Erik Max Francis:
  [...]
> This is, by the way, a pretty standard mechanism used in APIs that
> support callbacks; you give a callback, and an object/pointer/reference
> that will be sent to the callback by the caller, so that one can create
> a context for the callback.  (I know Tim knows this; this is for
> Afanasiy's benefit.)

It is fairly common, and makes sense in C; but it seems a little
odd in Python.  If os.path.walk had no such provision, but I had a
visitor function that needed a context object, then I'd just do
	walk(path, lambda d,n: visit(context, d, n))
or the like, and wouldn't think twice about it.

-- 
Steven Taschuk                  staschuk at telusplanet.net
"Telekinesis would be worth patenting."  -- James Gleick