os.walk() dirs and files

[rtilley]

Hello,

When working with file and dir info recursively on Windows XP. I'm going
about it like this:

for root, dirs, files in os.walk(path):
for f in files:
ADD F to dictionary
for d in dirs:
ADD D to dictionary

Is it possible to do something such as this:

for root, dirs, files in os.walk(path):
for f,d in files, dirs:
ADD F|D to dictionary

Just trying to save some lines of code and thought it wise to ask the
gurus before trying it

Thanks!

 

[rtilley]

Hello,

When working with file and dir info recursively on Windows XP. I'm going
about it like this:

for root, dirs, files in os.walk(path):
for f in files:
ADD F to dictionary
for d in dirs:
ADD D to dictionary

Is it possible to do something such as this:

for root, dirs, files in os.walk(path):
for f,d in files, dirs:
ADD F|D to dictionary

Just to clarify. In this particular case, I do not need to differentiate
between files and dirs... so would it be possible to do something such
as this:

for root, dirs, files in os.walk(path):
for fs_object in files, dirs:
ADD fs_object to dictionary

 

[Duncan Booth]

Just to clarify. In this particular case, I do not need to differentiate
between files and dirs... so would it be possible to do something such
as this:

How about just concatentating the two lists:

for root, dirs, files in os.walk(path):
for fs_object in files, dirs:

for fs_object in files + dirs:

 

[rtilley]

How about just concatentating the two lists:

Thank you Duncan! that solves the problem perfectly!

 

[George Sakkis]

Thank you Duncan! that solves the problem perfectly!

Or a bit more efficiently (no need to allocate a new list for storing
files+dirs):

from itertools import chain
for root, dirs, files in os.walk(path):
for fs_object in chain(files,dirs):
ADD fs_object to dictionary

Or you can download the path.py module
(http://www.jorendorff.com/articles/python/path/):

from path import path
for fs_object in path(root).walk():
ADD fs_object to dictionary


George

 

[Tim Peters]

[rtilley]

When working with file and dir info recursively on Windows XP. I'm going
about it like this:

for root, dirs, files in os.walk(path):
for f in files:
ADD F to dictionary
for d in dirs:
ADD D to dictionary

Is it possible to do something such as this:

for root, dirs, files in os.walk(path):
for f,d in files, dirs:
ADD F|D to dictionary

Just trying to save some lines of code and thought it wise to ask the
gurus before trying it

As has been pointed out,

for name in dirs + files:

is simple and effective. In a context where you don't want to endure
the memory burden of materializing a concatentated list, you can do

for name in itertools.chain(dirs, files):

intead.

 

[rtilley]

Or a bit more efficiently (no need to allocate a new list for storing
files+dirs):

from itertools import chain
for root, dirs, files in os.walk(path):
for fs_object in chain(files,dirs):
ADD fs_object to dictionary

I like that! itertools is cool... a bit abstract and computer sciencey,
but it sure does work in a practical manner