[Tutor] errno module - was File copying - best way?
Sun, 5 Aug 2001 18:42:42 -0400 (EDT)
On Sun, 5 Aug 2001, Michael P. Reilly wrote:
> On Sun, Aug 05, 2001 at 01:06:09PM -0400, email@example.com wrote:
> > I will study this and look at the rest of the exceptions listed for 'os;'
> > but what about the 'errno' module?
[good examples clipped - see previous message]
> Also notice that the filename is included. Not on all, but the ones that
> relate to file errors, will have this attribute.
That could be handy.
> Since a lot of different possible values can come from the exception,
> sometimes it is valuable to search for the proper error in the except
> dbfile = open(dbfilename, 'rb+')
> except IOError, err:
> if err.errno == errno.EACCES:
> dbfilename = find_alternate_location(dbfilename)
> dbfile = open(dbfilename, 'wb')
> elif err.errno == errno.ENOENT:
> dbfile = open(dbfilename, 'wb+')
Would this be a good candidate for a Class - ie FindError()
dbfile = open(dbfilename, 'rb+')
Something like that?
> The only other purpose I have found for using the errno module is when
> you are raising your own IOError or OSError exceptions.
Ok. But errno module won't work with the os.popen() function because it
(popen) doesn't raise an exception if it fails? Am I close?
- fleet -