os.path.walk arg

[Michael Hudson]

Steven Taschuk <staschuk at telusplanet.net> writes:

> 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.

You noticed :-)

> 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.

Or a bound method.

I suspect os.path.walk has made a net postive contribution to the
amount of confusion in the universe.

Cheers,
M.

-- 
  The Oxford Bottled Beer Database heartily disapproves of the 
  excessive consumption of alcohol.  No, really.
                        -- http://www.bottledbeer.co.uk/beergames.html
                           (now sadly gone to the big 404 in the sky)