[Tutor] Problem with os.walk

[Isr Gish]

Thanks Timyfor the help.
I hadn't relized that it has to be changed *in place*.

Isr

-----Original Message-----
   >From: "Tim Peters"<tim.one at comcast.net>
   >Sent: 5/11/04 10:56:00 AM
   >To: "Isr Gish"<isrgish at fastem.com>
   >Cc: "tutor at python.org"<tutor at python.org>
   >Subject: RE: [Tutor] Problem with os.walk
   >
   >[Isr Gish]
   >> The docs say that you can del the dirnames list.
   >
   >"the caller can modify the dirnames list in-place (e.g., via del or slice
   >assignment)"
   >
   >"in-place" means things of the form
   >
   >    del dirnames[1:]
   >
   >or
   >
   >    dirnames[:] = ['new directory']
   >
   >> But when I tried doing it, it didn't work.
   >
   >You have to show the exact code you used, else nobody can guess.
   >
   >...
   >
   >> I tried del
   >
   >That's not enough to guess.  Maybe you did
   >
   >    del dirnames
   >
   >?  That indeed would not work.
   >
   >> and dirnames = dirnames[0:0]
   >
   >The binds dirnames to a brand new object, so is not an in-place modification
   >either.  If you want to empty dirnames entirely, two ways to do it in-place
   >are
   >
   >    del dirnames[:]
   >
   >or
   >
   >    dirnames[:] = []
   >
   >> Both didn't work. The only thing that wOrked was.
   >> for d in dirnames[:]:
   >>     dirnames.remove(d)
   >
   >The two above will also work.
   >
   >> And if I didn't make a copy it didn't work correctly. (it seems
   >> that for i in list works with indexing behindethe seigns).
   >
   >Yes.  This is documented in the Language Reference manual (not the Library
   >Reference manual), in the section on "for" loops.
   >