supper fast walk

[gangli at msn.com]

In article <8po0dc$9sv$1 at news.news.kodak.com>,
  "Darrell Gallion" <darrell at dorb.com> wrote:
> I didn't have a performance issue, but used your code anyway. Thanks.
> Many hours spent reading newsgroups and 30 min to reuse some code
found
> there :)
You are welcome.

>
> Added 'RECYCLER'
> DIR_EXCLUDES = ('..','.','RECYCLER')

may add more:
DIR_EXCLUDES = ('..','.','RECYCLER', 'PYTHON', 'WINNT')

>
> This one is non standard, allows the func to avoid descending.
>     # call callback function
>     cc = func(arg, top, f_objs, subdirs)
>     if cc == 0:
>         return
>

Instead of checking returns, change subdirs in func:
    del subdirs[:] #stop descending


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