does python have useless destructors?
dkturner at telkomsa.net
Fri Jun 11 22:44:38 CEST 2004
tfb+google at tfeb.org (Tim Bradshaw) wrote in message news:<fbc0f5d1.0406110524.3e44c422 at posting.google.com>...
> dkturner at telkomsa.net (David Turner) wrote in message news:<e251b7ba.0406100011.39a795e1 at posting.google.com>...
> > This makes me sad. But there is some hope in the following pattern,
> > although it can be quite awkward:
> > def with_file(fname, mode, oper):
> > f = open(fname, mode);
> > try:
> > oper()
> > finally:
> > f.close()
> > Of course, this can very quickly turn your code into so much
> > functional goo. That's not necessarily a bad thing, as Lisp
> > programmers can attest... But it's still not quite as powerful as
> > RAII.
> No Lisp programmer worth their salt would tolerate such a horror. In
> the specific case above there's already an idiom for doing this in
> Common Lisp:
Actually I was thinking more of the open() function than with the
with_file() function when I said "functional goo" :-).
It's really quite funny that Lisp doesn't suffer much from this sort
of problem. You'd think we'd learn...
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