[Python-bugs-list] [ python-Bugs-516232 ] Windows os.path.isdir bad if drive only

noreply@sourceforge.net noreply@sourceforge.net
Tue, 12 Feb 2002 13:54:21 -0800


Bugs item #516232, was opened at 2002-02-11 14:50
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=516232&group_id=5470

Category: Extension Modules
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Charles I. Fuller (cifuller)
Assigned to: Nobody/Anonymous (nobody)
Summary: Windows os.path.isdir bad if drive only

Initial Comment:
It seems that most os functions recognize the Windows 
drive letter without a directory as the current 
directory on the drive, but os.path.isdir still 
returns 0.  If os.listdir('C:') returns data, 
os.path.isdir('C:') should return 1 for consistency.

C:\folder_on_C>python
Python 2.2 (#28, Dec 21 2001, 12:21:22) [MSC 32 bit 
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for 
more information.
>>> import os
>>> os.system('dir C:')
 Volume in drive C has no label.
 Volume Serial Number is E4C9-AD16

 Directory of C:\folder_on_C

02/11/2002  05:29p      <DIR>          .
02/11/2002  05:29p      <DIR>          ..
02/11/2002  05:29p      <DIR>          subA
02/11/2002  05:29p      <DIR>          subB
               0 File(s)              0 bytes
               4 Dir(s)  22,126,567,424 bytes free
0
>>> os.listdir('C:')
['subA', 'subB']
>>> os.path.abspath('C:')
'C:\folder_on_C'
>>> os.path.isdir('C:')
0

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>Comment By: Charles I. Fuller (cifuller)
Date: 2002-02-12 13:54

Message:
Logged In: YES 
user_id=211047

Responding to Tim's followup...

In this case the 'C:' is not the root drive, it is the 
current dir on that drive.  I noticed that os.path.abspath 
was updated between 2.0 and 2.2 to recognize the current 
dir.

It's an inconsistency that tripped me up already.

>>> os.path.isdir('C:')
0
>>> os.path.isdir(os.path.abspath('C:'))
1

The listdir has been working with drive specs (recognizing 
the current dir) for a while.  The abspath code must be 
handling the drive-only input as a special case.  The isdir 
function should do the same for consistency.

There should at least be a warning in the docs...

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Comment By: Tim Peters (tim_one)
Date: 2002-02-11 15:16

Message:
Logged In: YES 
user_id=31435

Sorry, this is how Microsoft's implementation of the 
underlying stat() function works.  "Root drive" paths must 
be given with a trailing slash or backslash, else MS stat() 
claims they don't exist.  You'll see the same irritating 
behavior in C code.  Attempts to worm around it in the past 
have introduced other bugs; see bug 513572 for a current 
example.

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