os.path.walk arg

Steven Taschuk staschuk at telusplanet.net
Fri Mar 14 08:42:02 CET 2003

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

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