3rd argument to os.path.walk(): Why?

[Rob Hooft]

 AM> E.g., say you want to _count_ the files:

 AM> import os

 AM> class Counter:
 AM>   def __init__(self):
 AM>     self.count = 0
 AM>   def inc(self, n=1):
 AM>     self.count += n

 AM> def count_names(count, dir, flist):
 AM>   count.inc(len(flist))

 AM> count = Counter()
 AM> os.path.walk("/", count_names, count)

 AM> print count.count,"files in all"

If you'd do this, why not make "count_names" a method of the Counter
class?

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