On Thu, Apr 13, 2017 at 1:46 PM, Ben Bacarisse <ben.use...@bsb.me.uk> wrote: > James McMahon <jsmcmah...@gmail.com> writes: > >> Is there a way to mask the F_OK, R_OK, and W_OK in a single os.access >> call? I'm guessing there must be, rather than doing this >> >> if ( os.access(fqfname,os.F_OK) and os.access(fqfname,os.R_OK) and >> os.access(fqfname,os.W_OK)) : > > You can "or" together os.R_OK | os.W_OK into one call but you can can't
bitwise OR. > do that with F_OK. Mind you, I'm not sure that matters since I can't > think of a case where you want to fail because os.F_OK fails but os.R_OK > and os.W_OK succeeds. In other words, why not just test for os.R_OK | > os.W_OK? > > Note that despite using the "or" operation to construct the parameter, > the test is an implied "and": > > os.access(fqfname, os.R_OK | os.W_OK) > > is true only if both read and write access are permitted. Note that os.access doesn't check file security on Windows. W_OK just checks the read-only flag. Thus using try/except is really the only possibility if you're on Windows and aren't using the Windows security API. -- https://mail.python.org/mailman/listinfo/python-list
