Hi Neil,
Neil Hodgson wrote:
[snip]
> There is no PEP yet but there is a wiki page.
> http://wiki.python.org/moin/PathClass
> Guido was unenthusiastic so a good step would be to produce some
> compelling examples.
I guess it depends on what is "compelling" :)
I've been trying to come up with some cases that I've run into where
the path module has helped. One case I just came across was trying to
do the equivalent of 'du -s *' in python, i.e. get the size of each of
a directory's subdirectories. My two implemenations are below:
import os
import os.path
from path import path
def du_std(d):
"""Return a mapping of subdirectory name to total size of files in
that subdirectory, much like 'du -s *' does.
This implementation uses only the current python standard
libraries"""
retval = {}
# Why is os.listdir() and not os.path.listdir()?
# Yet another point of confusion
for subdir in os.listdir(d):
subdir = os.path.join(d, subdir)
if os.path.isdir(subdir):
s = 0
for root, dirs, files in os.walk(subdir):
s += sum(os.path.getsize(os.path.join(root,f)) for f in
files)
retval[subdir] = s
return retval
def du_path(d):
"""Return a mapping of subdirectory name to total size of files in
that subdirectory, much like 'du -s *' does.
This implementation uses the proposed path module"""
retval = {}
for subdir in path(d).dirs():
retval[subdir] = sum(f.getsize() for f in subdir.walkfiles())
return retval
I find the second easier to read, and easier to write - I got caught
writing the first one when I wrote os.path.listdir() instead of
os.listdir().
Cheers,
Chris
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