[SciPy-dev] adding a nice progressbar to scipy

Ondrej Certik ondrej@certik...
Fri Jan 11 20:54:19 CST 2008

On Jan 12, 2008 3:26 AM, Fernando Perez <fperez.net@gmail.com> wrote:
> On Jan 11, 2008 6:52 PM, Ondrej Certik <ondrej@certik.cz> wrote:
> > So what is the conclusion?
> >
> > Maybe I should stress, that the progress bar is just one file with 300
> > lines of code.
> >
> > So it's not really a package, just a feature. I was thinking of
> > scipy.io, but ipython
> > is maybe better. If it can contain interaction with gnuplot, why not a simple
> > progressbar? :)
> A few questions:
> - Will it run *correctly* under Windows?  I don't use it, but I don't
> want the text-only core of ipython to start sprouting functionality
> that breaks under windows (or any OS for that matter).  Same thing for
> Linux/OSX.  I know it says 'os independent', but I want independent
> confirmation of that statement.

Right, I don't know, since I don't use windows and I cannot test it.

> - It makes calls to ioctl() without checks that the import at the top
> actually worked.  That will break somewhere, I guarantee it.

It's used in handle_resize only, which is only used in

                signal.signal(signal.SIGWINCH, self.handle_resize)
                self.signal_set = True
                self.term_width = 79

I am not saying it's the best programming practice, but I think
it will work without ioctl quite well.

> - Is signal.SIGWINCH available on all OSes?

I don't know.

> - termios is also used without checks.  That will likely throw an
> exception under windows.

Again only in handle_resize(), which is only called in the code above,
so it should be safe.

> - Etc.  This code doesn't look like it's ever been properly tested for
> cross-platform compatibility.  Welcome to the real world.

Right. I can only say that it works well in Debian.

> If all of the above were to be addressed, it's small enough that I'm
> willing to throw it into ipython.externals for convenience.  300 lines
> is a drop in the bucket at this point, and for interactive work it can
> come in very handy, I agree.  No sysadmin will notice it's hiding in
> there :)
> In this case, a few things:
> - You said that the author would BSD license it, but the current code
> http://pypi.python.org/pypi/progressbar still shows LGPL-only.  I
> won't put it in until we get from him a BSD-licensed file.

Yes, he only sent an email to me, I can ask him to send an email to
this list too.

> - Please send us the patch you suggested writing for the more comon case.

I'll send it to the ipython list.

> - You commit to letting us know when an update is warranted and
> sending us the corresponding patch, so that the ipython developers can
> apply it with minimal effort.

I commit. The final decision needs to be made by ipython developers though,
if they are willing to maintain such a code if I won't be available
(for any reason). But except
the points you raised, I think it's very readable, so there shouldn't
be a problem with that.


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