Tim Golden wrote: > [Tim Daneliuk] >> I have a program wherein I want one behavior when a file is >> set as executable and a different behavior if it is not. Is >> there a simple way to determine whether a given named file is >> executable that does not resort to all the lowlevel ugliness >> of os.stat() AND that is portable across Win32 and *nix? > > I'm fairly certain the answer is no. What follows is a > relatively low-level and certainly not portable discussion. > > The last couple of times this question came up on the list > I looked into the implementation and experimented a bit > but in short I would say that os.stat / os.access were > near enough useless for determining executablility under > Windows. That's not down to Python as such; it's simply > passing back what the crt offers. > > Of course that raises the slightly wider issue of: should > the Python libs do more than simply call the underlying > crt especially when that's known to give, perhaps misleading > results? But I'm in no position to answer that. > > I suggest that for Windows, you either use the PATHEXT > env var and determine whether a given file ends with > one of its components. Or -- and this depends on your > definition of executable under Windows -- use the > FindExecutable win32 API call (exposed in the win32api > module of pywin32 and available via ctypes) which will > return the "executable" for anything which has an > association defined. So the "executable" for a Word > doc is the winword.exe program. The "executable" for > an .exe is itself. > > TJG >
This seems to work, at least approximately: os.stat(selected)[ST_MODE] & (S_IXUSR|S_IXGRP|S_IXOTH It probably does not catch every single instance of something that could be considered "executable" because this is a sort of fluid thing in Windows (as you point out). -- ---------------------------------------------------------------------------- Tim Daneliuk [EMAIL PROTECTED] PGP Key: http://www.tundraware.com/PGP/ -- http://mail.python.org/mailman/listinfo/python-list
