another python style question -- copying a data file
guy at obstruction.com
Tue Apr 22 20:45:52 CEST 2003
In article <mailman.1051033654.17248.python-list at python.org>,
=?ISO-8859-1?Q?Gerhard_H=E4ring?= <gh at ghaering.de> wrote:
> Guy Middleton wrote:
> > Ok, here's another style question.
> > I want to copy a data file, but if the file doesn't already exist, I don't
> > care. I do care about any other errors, such as wrong permissions.
> > I have the following code, is this a typical Python way to do this?
> > try:
> > os.stat(DATAFILE)
> > os.system("cp %s %s.new" % (DATAFILE, DATAFILE))
> > except OSError, arg:
> > # ENOENT is ok, we didn't do the copy
> > # anything else is a problem
> > if arg.errno != errno.ENOENT:
> > raise
> Here's what I'd do:
> if os.path.exists(DATAFILE):
> shutil.copyfile(DATAFILE, "%s.new" % DATAFILE)
Aha, I didn't know about shutil. This is obviously better. :-)
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