Robert Kern wrote:
On 2009-06-29 14:31, Tim Pinkawa wrote:
On Mon, Jun 29, 2009 at 2:17 PM, Christian Heimes<li...@cheimes.de>
wrote:
"if file in os.list()" is slow and not correct. You have to check if the
file is either a real file or a symlink to a file and not a directory or
special. Then you have to verify that the file has the executable
bit, too.
I realize four lines of Python does not replicate the functionality of
which exactly. It was intended to give the original poster something
to start with.
I am curious about it being slow, though. Is there a faster way to get
the contents of a directory than os.listdir() or is there a faster way
to see if an element is in a list other than "x in y"? I believe
'which' will terminate once it finds any match, which mine does not,
but that can be fixed by adding a break after the print.
Just check if os.path.exists(os.path.join(path, filename)).
But on windows, checking for a list of possible extensions, it may well
be faster to operate on the listdir output. I made my which-equivalent
function a generator, so I could choose to stop at the first entry or
continue at the invoker's pleasure (good for both Trojan-discovery and
"forgot to delete the .pyc" operations).
--Scott David Daniels
scott.dani...@acm.org
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