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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 541-302-1107 ________________________ We who cut mere stones must always be
envisioning cathedrals. —Quarry worker's creed |
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