[Twisted-Python] wxpython issues

Shawn Church Sl_Church at sbcglobal.net
Fri Apr 15 16:28:35 EDT 2005

OK,  I will adopt the threaded approach.  Despite it's mainloop problems
(they can surface even without twisted) I still like wx.  I develop on a
linux system but support mostly windows clients and wx makes this easy. 
Thanks to everyone for their valuable responses to my questions.

Glyph Lefkowitz wrote:

> Shawn Church wrote:
>> I have looked at implementations of Soap,  CORBA,  and Pyro,  none of
>> which
>> have really statisfied me.  I thought that by using the PB interface of
>> twisted,  along with a SSL connection,  I could achieve all of my
>> objectives
>> fairly simply -- once I worked out the details I was able connect, 
>> login,
>> and transfer data with very little code.
> All of this, and more, is possible with Twisted.
>> I fully realize that if I want to write a GUI application that
>> depends upon
>> arbitrary responses from the server (i.e. a chat client to use your
>> example)
>> then my approach will not work.
> That was an example of where the brokenness would be instantly visible
> to any user of your program.  Internally Twisted makes many
> assumptions about the reactor generally being running which may cause
> you lots of little surprises if you use the technique you've proposed.
>> What I want to do is have my clients request
>> data from the server and wait till the data is ready (seems prettty
>> simple
>> :-))
> the Twisted way is to invert it so that rather than saying "Wait until
> Y is done, then do X", you say "Do X when Y is done."  Among other
> things, this approach lets you do more than one thing at a time.  For
> example, you might want to put a "cancel" button in your UI if your
> application has to run over the internet.  Responding to the cancel
> button at the same time as waiting for a request's response is a
> second thing, so you need to be worried about concurrency even in
> simple applications.
> > Twisted seems to do what I want (assuming I can interface with wx),
>> but if you can point to another package please let me know.
> I would point you at gtk, Tkinter, or win32api, not an alternative to
> Twisted :).  wx is the problem here: its mainloop is badly broken, on
> all platforms.  Twisted works fine.  The easiest fix, if wx is a
> genuine requirement, is to run the wx main loop in a Twisted thread,
> using callInThread, so that the Twisted event loop (i.e. the one that
> isn't horribly broken) is "in charge".
> I believe that future releases of wx are fixing this issue, as well,
> since you're far from the first person to have complained about it.  I
> hope that this happens soon, since despite its many flaws wx is very
> popular in the Python community.
> P.S.: If I seem negative towards WX, it is only because my _only_ use
> of it is answering this same question over and over again.  I'm sure
> it has some positive points too, but I never discover them, because
> for my own development projects "non-broken mainloop" is criterion #1
> for the GUI framework ;-)
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