problem with listdir

[jimgardener]

hi
i have a directory containing .pgm files of P5 type.i wanted to read
the pixel values of these files ,so as a firststep i wrote code to
make a list of filenames using listdir

pgmdir="f:\code \python\pgmgall ery" # where i have pgm files
g2=listdir(pgmd ir)

i get the following error
WindowsError: [Error 123] The filename, directory name, or volume
label syntax is incorrect: 'f:\\code\\pyth on\pgmgallery/*.*'

i am running python on winXP ..can anyone tell me why i get this
error?

[David]

Re: problem with listdir

>

i get the following error
WindowsError: [Error 123] The filename, directory name, or volume
label syntax is incorrect: 'f:\\code\\pyth on\pgmgallery/*.*'
>
i am running python on winXP ..can anyone tell me why i get this
error?
--

>From some Googling, it looks like this error can happen in Windows

when you have registry problems. This isn't a Python problem as far as
I can tell.

A few things for you to try:

* Try running your code on another machine with the same directory.

* Run cmd.exe and see if you can run "dir f:\\code\\pytho n\pgmgallery/*.*"

* Try using other drives besides F: (C: is a good start)

* Try using other directories under F: drive in your program and see
when you start hitting the problem.

David.

[Francesco Bochicchio]

Re: problem with listdir

On Sat, 26 Apr 2008 01:24:23 -0700, jimgardener wrote:

hi
i have a directory containing .pgm files of P5 type.i wanted to read
the pixel values of these files ,so as a firststep i wrote code to
make a list of filenames using listdir
>
pgmdir="f:\code \python\pgmgall ery" # where i have pgm files
g2=listdir(pgmd ir)
>
i get the following error
WindowsError: [Error 123] The filename, directory name, or volume
label syntax is incorrect: 'f:\\code\\pyth on\pgmgallery/*.*'
>
i am running python on winXP ..can anyone tell me why i get this
error?

Did you try using a raw string as pathname
pgmdir=r"f:\cod e\python\pgmgal lery"
?

AFAIK, the character '\' in interpreted in Python as the beginning of
an escape sequence (such as '\n') and it should be doubled ( as in the
error message) or a raw string should be used, telling Python that there
are no escape sequences inside.
However, from the message it looks like the path as been understood as
such, so this might not be the case.

Ciao
-----
FB

[Kam-Hung Soh]

Re: problem with listdir

On Sat, 26 Apr 2008 19:07:45 +1000, Francesco Bochicchio
<bockman@virgil io.itwrote:

On Sat, 26 Apr 2008 01:24:23 -0700, jimgardener wrote:
>

>hi
>i have a directory containing .pgm files of P5 type.i wanted to read
>the pixel values of these files ,so as a firststep i wrote code to
>make a list of filenames using listdir
>>
>pgmdir="f:\cod e\python\pgmgal lery" # where i have pgm files
>g2=listdir(pgm dir)
>>
>i get the following error
>WindowsError : [Error 123] The filename, directory name, or volume
>label syntax is incorrect: 'f:\\code\\pyth on\pgmgallery/*.*'
>>
>i am running python on winXP ..can anyone tell me why i get this
>error?

>
Did you try using a raw string as pathname
pgmdir=r"f:\cod e\python\pgmgal lery"
?
>
AFAIK, the character '\' in interpreted in Python as the beginning of
an escape sequence (such as '\n') and it should be doubled ( as in the
error message) or a raw string should be used, telling Python that there
are no escape sequences inside.
However, from the message it looks like the path as been understood as
such, so this might not be the case.
>
Ciao
-----
FB

Neither \c nor \p are escape characters in Section 2.4.1 "String literals".

Could there be some files in that directory whose name is not a valid
Windows file name? Windows file names cannot have the following symbols:

\ / : * ? " < |

--
Kam-Hung Soh <a href="http://kamhungsoh.com/blog">Software Salariman</a>

[jimgardener]

Re: problem with listdir

* Run cmd.exe and see if you can run "dir f:\\code\\pytho n\pgmgallery/*.*"
>

that causes a message 'Invalid switch - "*.*".'

* Try using other directories under F: drive in your program and seewhen you start hitting the problem.

i tried that..on some directories in the same drive this gives
correct result and returns a list of filenames.howev er the error
occurs on other directories ,looks like a weird windows problem!

[David]

Re: problem with listdir

On Sat, Apr 26, 2008 at 7:56 PM, jimgardener <jimgardener@gm ail.comwrote:

>

* Run cmd.exe and see if you can run "dir f:\\code\\pytho n\pgmgallery/*.*"
>

>
that causes a message 'Invalid switch - "*.*".'
>
>

Probably because on the command-line, / means a command-line option.
Been a while since I used DOS.

Try this instead:

dir f:\code\python\ pgmgallery\*.*"

David.

[castironpi@gmail.com]

Re: problem with listdir

On Apr 27, 1:57 am, David <wizza...@gmail .comwrote:

On Sat, Apr 26, 2008 at 7:56 PM, jimgardener <jimgarde...@gm ail.comwrote:
>

 * Run cmd.exe and see if you can run "dir f:\\code\\pytho n\pgmgallery/*.*"

>

 that causes a message 'Invalid switch - "*.*".'

>
Probably because on the command-line, / means a command-line option.
Been a while since I used DOS.
>
Try this instead:
>
dir f:\code\python\ pgmgallery\*.*"
>
David.

Try typing listdir( '.' ), which is Windows for 'the current path
[being used]', at an interpreter. listdir does not accept wildcards,
(surmisably since reg.exes are more powerful) and try ending with a
slash.