From: Carlos Daniel Ruvalcaba Valenzuela <[EMAIL PROTECTED]>
Date: Jun 2, 2006 11:10 PM
Subject: Re: [Tutor] Trouble with os.path.isfile
To: "Carroll, Barry" <[EMAIL PROTECTED]>
Here is the problem IMO:
I did some modifications to your code (very minimal on ifs) and it worked:
import os
def lstdirsnfiles(tdir):
flst = os.listdir(tdir)
flst.sort()
fnames = []
dnames = ['.', '..']
for name in flst:
absfn = os.path.join(tdir, name)
if os.path.isdir(absfn):
dnames.append(name)
if os.path.isfile(absfn):
fnames.append(name)
return (dnames, fnames)
(dirs, files) = lstdirsnfiles('/home/clsdaniel')
It returns correctly all directories and files.
Regards
Carlos Daniel Ruvalcaba Valenzuela
On 6/2/06, Carroll, Barry <[EMAIL PROTECTED]> wrote:
>
>
>
>
> Greetings:
>
>
>
> One of the functions of my test system web server program is to allow the
> user to view the contents of the image file directories and select files to
> load onto the hardware. Obviously, a central part of this function is to
> identify and display the names of directories and files in a specified
> directory. I haven't been able to find any canned code or cookbook entries
> that do this, so I'm making one from scratch. Here is the helper function
> that gets and returns the directory and file names:
>
>
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>
>
> def lstdirsnfiles(tdir):
>
> flst = os.listdir(tdir)
>
> flst.sort()
>
> fnames = []
>
> dnames = ['.', '..']
>
> for name in flst:
>
> absfn = os.path.join(tdir, name)
>
> if os.path.isdir(absfn):
>
> dnames.append(name)
>
> elif os.path.isfile(absfn):
>
> fnames.append(name)
>
> return dnames, fnames
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>
>
>
>
> The root of the image file directory tree is "/home/iip/images". When
> lstdirsnfiles is run with tdir set appropriately, the lists returned
> contain no additional information: dnames = ['.', '..'] and fnames = []. I
> added some tracing statements to see what was happening inside the
> function:
>
>
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>
>
> def lstdirsnfiles(tdir):
>
> global DEBUG, dbgfname
>
> DEBUG = True
>
>
>
> flst = os.listdir(tdir)
>
> flst.sort()
>
> fnames = []
>
> dnames = ['.', '..']
>
>
>
> if DEBUG:
>
> dbgf = open(dbgfname,mode="a")
>
> dbgf.write("\n"+str (time.localtime())+"\n")
>
> dbgf.write("Entering lstdirsnfiles\n")
>
> dbgf.write("The directory = %s\n" % tdir)
>
> dbgf.write("The file list = %s\n" % flst)
>
>
>
> for name in flst:
>
> absfn = os.path.join(tdir, name)
>
>
>
> if DEBUG:
>
> dbgf.write("File path = %s, isfile = %s\n" %
>
> (absfn, os.path.isfile(absfn)))
>
>
>
> if os.path.isdir(absfn):
>
> dnames.append(name)
>
> elif os.path.isfile(absfn):
>
> fnames.append(name)
>
>
>
> if DEBUG:
>
> dbgf.write("dnames = %s\n" % dnames)
>
> dbgf.write("fnames = %s\n" % fnames)
>
> dbgf.close()
>
> DEBUG = False
>
>
>
> return dnames, fnames
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>
>
>
>
> The log vile received the following:
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>
>
> (2006, 6, 2, 15, 23, 4, 4, 153, 1)
>
> Entering lstdirsnfiles
>
> The directory = /home/iip/images
>
> The file list = ['test1.bmp', 'test2.bmp', 'test3.bmp', 'test4.bmp',
> 'test5.bmp', 'test6.bmp']
>
> File path = /home/iip/images/test1.bmp, isfile = False
>
> File path = /home/iip/images/test2.bmp, isfile = False
>
> File path = /home/iip/images/test3.bmp, isfile = False
>
> File path = /home/iip/images/test4.bmp, isfile = False
>
> File path = /home/iip/images/test5.bmp, isfile = False
>
> File path = /home/iip/images/test6.bmp, isfile = False
>
> dnames = ['.', '..']
>
> fnames = []
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>
>
>
>
> So there are entries in the directory, but the function doesn't recognize
> them as files.
>
>
>
> Finally, I opened the interpreter and tried doing this, as nearly as
> possible, interactively. I got this:
>
>
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>
>
> >>> import os
>
> >>> tdir = '/home/iip/images'
>
> >>> os.listdir(tdir)
>
> ['test4.bmp', 'test3.bmp', 'test2.bmp', 'test1.bmp', 'test5.bmp',
> 'test6.bmp']
>
> >>> flst = os.listdir(tdir)
>
> >>> flst.sort()
>
> >>> flst
>
> ['test1.bmp', 'test2.bmp', 'test3.bmp', 'test4.bmp', 'test5.bmp',
> 'test6.bmp']
>
> >>> for name in flst:
>
> ... absfn = os.path.join(tdir,name)
>
> ... print absfn, "is",
>
> ... if not os.path.isfile(absfn):
>
> ... print "NOT",
>
> ... print "a file"
>
> ...
>
> /home/iip/images/test1.bmp is a file
>
> /home/iip/images/test2.bmp is a file
>
> /home/iip/images/test3.bmp is a file
>
> /home/iip/images/test4.bmp is a file
>
> /home/iip/images/test5.bmp is a file
>
> /home/iip/images/test6.bmp is a file
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
>
>
> As you can see, the interpreter correctly identifies the strings in the list
> as names of files, but my function does not. I can't see anything wrong
> with the logic in the function. Can any or you see the problem I'm missing?
>
>
>
> As always, thanks in advance for your help.
>
>
>
> Barry
>
> [EMAIL PROTECTED]
>
> 541-302-1107
>
> ________________________
>
> We who cut mere stones must always be envisioning cathedrals.
>
> —Quarry worker's creed
>
>
> _______________________________________________
> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
>
>
_______________________________________________
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
