Chris Rebert wrote:
On Thu, Oct 29, 2009 at 9:53 PM, Peng Yu <pengyu...@gmail.com> wrote:
I don't see a way to avoid walking over directories of certain names
with os.walk. For example, I don't want os.walk return files whose
path include '/backup/'. Is there a way to do so? Otherwise, maybe I
will have to make my own program. Thank you!
Read the docs! (http://docs.python.org/library/os.html#os.walk):
"""
os.walk(top[, topdown=True[, onerror=None[, followlinks=False]]])
Generate the file names in a directory tree by walking the tree
either top-down or bottom-up. For each directory in the tree rooted at
directory top (including top itself), it yields a 3-tuple (dirpath,
dirnames, filenames).
[...]
When topdown is True, the caller can modify the dirnames list
in-place (perhaps using del or slice assignment), and walk() will only
recurse into the subdirectories whose names remain in dirnames; this
can be used to prune the search, impose a specific order of visiting,
or even to inform walk() about directories the caller creates or
renames before it resumes walk() again.
"""
They even include a specific code example of how to skip unwanted
subdirectories.
Cheers,
Chris
--
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The other thing to note is that it's easy to build a generator from
os.walk() with whatever customization you like. Then the program can
use the generator the same way as he would use walk, just adding a list
of directories to skip.
For example (untested)
def mywalk(top, skipdirs=[]):
for root, dirs, files in os.walk(top):
for skipdir in skipdirs:
dirs.remove(skipdir) # don't visit this directory
yield root, dirs, files
DaveA
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