[Twisted-Python] Twisted & Qt

David Pratt fairwinds at eastlink.ca
Mon Sep 25 12:00:31 EDT 2006

Hi Ed. Let's please leave the licensing issues of Twisted alone. This 
change was made quite some time ago as a license that would encourage 
developers to use Twisted. I think this should be respected and the 
licensing of code you are willing to commit, committed at MIT, so we 
don't need to open this debate.

It is a reasonable and open license for this type of framework and there 
is no point in cutting off commercial developers that wish to use it by 
inserting GPL code. The point is that there are those who do in fact 
obtain a license from Trolltech and will not wish to mix GPL with a 
proprietary app, thus the MIT works well for this. Many thanks.


Ed Suominen wrote:
> I'm using the qtreactor in a GPL-but-unreleased PyQt 4.1 application of
> my own, and have not found any problems whatsoever with the integration
> of the Qt Twisted event loops.  It's really a pretty slick combination.
> As an example and a contribution, I offer the following (GPL'd) module:
> http://deadbeefbabe.org/paste/1996 (syntax-highlighted version),
> http://foss.eepatents.com/misc/qt-twisted-dialog.py (source). It allows
> you to construct a non-blocking modal dialog, immediately obtaining a
> deferred to the user's eventual input.
> As an aside, I would be interested in people's viewpoints about whether
> the Qt reactor is suitable for Twisted's MIT-style license, given that
> it doesn't actually import any Qt code itself. It leaves that step up to
> the user with the installation of a reactor into the Qt application
> object. As every Qt user probably knows, the Qt library itself is
> dual-licensed under either the GPL or Trolltech's proprietary license.
> Best regards, Ed
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