On Tuesday, September 11, 2012 12:21:24 AM UTC-7, Tim Golden wrote:
> And so it does, but you'll notice from the MSDN docs that the \\?
> syntax must be supplied as a Unicode string, which os.listdir
> will do if you pass it a Python unicode object and not otherwise:
I was saying os.listdir doesn't like the r'\\?\' prefix.
But Tim corrects me -- so yes, Steven's earler suggestion "Why don't you just
prepend a '?' to paths like they tell you to?" does work, when I supply it in
unicode.
Good:
>>> os.listdir(u'\\\\?\\C:\\Users\\john\\Desktop\\sandbox\\goo')
[u'voo...']
Bad:
>>> os.listdir('\\\\?\\C:\\Users\\john\\Desktop\\sandbox\\goo')
Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
os.listdir('\\\\?\\C:\\Users\\john\\Desktop\\sandbox\\goo')
WindowsError: [Error 123] The filename, directory name, or volume label
syntax is incorrect: '\\\\?\\C:\\Users\\john\\Desktop\\sandbox\\goo/*.*'
Thanks to both of you for taking the time to teach.
BTW, when I posted the original, I was trying to supply my own customized
ntpath module, and I was really puzzled as to why it wasn't getting picked up!
According to sys.path I expected my custom ntpath.py to be chosen, instead of
the standard Lib/ntpath.py.
Now I guess I understand why. I moved Lib/ntpath.* out of the way, and learned
that during initialization, Python is importing "site" module, which is
importing "os" which is importing "ntpath" -- before my dir is added to
sys.path. So later when I import os, it and ntpath have already been imported,
so Python doesn't attempt a fresh import.
To get my custom ntpath.py honored, need to RELOAD, like:
import os
import ntpath
reload(ntpath)
print 'os.walk(\'goo\') with isdir override in custom ntpath'
for root, dirs, files in os.walk('goo'):
print root, dirs, files
where the diff betw standard ntpath.py and my ntpath.py are:
14c14,19
< from genericpath import *
---
> from genericpath import *
>
> def isdir(s):
> return genericpath.isdir('\\\\?\\' + abspath(s + '\\'))
> def isfile(s):
> return genericpath.isfile('\\\\?\\' + abspath(s + '\\'))
I'm not sure how I could have known that ntpath was already imported, since *I*
didn't import it, but that was the key to my confusion.
Thanks again for the help.
John
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