Python 3.5/3.6 asyncio with wxPython Phoenix

[Brendan Simon (eTRIX)]

I'm playing with MicroPython using asyncio coroutines to do some tasks
(e.g. scan a 4x4 keypad matrix and display stuff on a LCD).

I want to also be able to simulate my environment using wxPython Phoenix
to provide fake LCD and Keypad.

How can I use wxPython Phoenix with Python 3.5/3.7 asyncio
functionality, so that I can run the coroutines and also hand GUI events?

I've searched high and low for info but no hits.

Would it be something as simple as the following?  I'm thinking there
must be some more magic involved.

    ## wx application
    wxapp = MyWxApp(False)

    ## Get a handle to the asyncio event loop.
    loop = asyncio.get_event_loop()

    ## Add coroutines to the event loop.
    loop.create_task( keypad_scanner_coro() )
    loop.create_task( keypad_watcher_coro() )
    loop.create_task( wxapp.MainLoop() )

    ## Start running the coroutines
    loop.run_forever()

Thanks, Brendan.

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[Dietmar Schwertberger-2]

On 12.03.2017 08:02, Brendan Simon (eTRIX) wrote:
> I'm playing with MicroPython using asyncio coroutines to do some tasks
> (e.g. scan a 4x4 keypad matrix and display stuff on a LCD).
I also tried my PyBoard this week for the first time...

> I want to also be able to simulate my environment using wxPython Phoenix
> to provide fake LCD and Keypad.
>
> How can I use wxPython Phoenix with Python 3.5/3.7 asyncio
> functionality, so that I can run the coroutines and also hand GUI events?
Your example would not work, as MainLoop() does only return once you
close your wx application.
As of now, there's no asyncio / wx integration that I'm aware of.
The MainLoop is implemented in C++, so it's probably not trivial to add
support.

I have been using Qamash for some small programs (i.e. the PyQt/asyncio
integration). asyncio support would probably be the coolest and most
important feature to add to wxPython, once Phoenix is released.

As workaround, you could use a separate thread for the asyncio main
loop, but that's not as nice as native support.
Alternatively, you may try to run the asyncio loop from within an
EVT_IDLE handler. If you try this, please post your results.
Instead of calling loop.run_forever you would need to call _run_once on
each idle event. See the implementation of run_forever.


Regards,

Dietmar

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[Brendan Simon (eTRIX)]

> functionality, so that I can run the coroutines and also hand GUI events?

> How can I use wxPython Phoenix with Python 3.5/3.7 asyncio
Your example would not work, as MainLoop() does only return once you
close your wx application.
As of now, there's no asyncio / wx integration that I'm aware of.
The MainLoop is implemented in C++, so it's probably not trivial to add
support.

I have been using Qamash for some small programs (i.e. the PyQt/asyncio
integration). asyncio support would probably be the coolest and most
important feature to add to wxPython, once Phoenix is released.

As workaround, you could use a separate thread for the asyncio main
loop, but that's not as nice as native support.
Alternatively, you may try to run the asyncio loop from within an
EVT_IDLE handler. If you try this, please post your results.
Instead of calling loop.run_forever you would need to call _run_once on
each idle event. See the implementation of run_forever.

Dietmar

Thanks Dietmar,

OK.  I think I'll try the EVT_IDLE approach to start with and see how I go.

I figured there must have been some kind of async integration as Twisted has some kind of method to use wxPython.

http://twistedmatrix.com/documents/12.3.0/core/howto/choosing-reactor.html#auto13

Can something similar be done using asyncio?

Brendan.

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[Brendan Simon (eTRIX)]

On 13/3/17 2:52 pm, Brendan Simon (eTRIX) wrote:

> functionality, so that I can run the coroutines and also hand GUI events?

> How can I use wxPython Phoenix with Python 3.5/3.7 asyncio
Your example would not work, as MainLoop() does only return once you
close your wx application.
As of now, there's no asyncio / wx integration that I'm aware of.
The MainLoop is implemented in C++, so it's probably not trivial to add
support.

I have been using Qamash for some small programs (i.e. the PyQt/asyncio
integration). asyncio support would probably be the coolest and most
important feature to add to wxPython, once Phoenix is released.

As workaround, you could use a separate thread for the asyncio main
loop, but that's not as nice as native support.
Alternatively, you may try to run the asyncio loop from within an
EVT_IDLE handler. If you try this, please post your results.
Instead of calling loop.run_forever you would need to call _run_once on
each idle event. See the implementation of run_forever.

Dietmar

OK.  I think I'll try the EVT_IDLE approach to start with and see how I go.

Here is an example I put together.

https://github.com/BrendanSimon/micropython_experiments/blob/master/keypad_lcd/wx_asyncio_test_1.py

It has 4 gauges in a dialog.  Gauge 1 is updated via wxTimer every 100ms.  Gauges 2-4 are updated via asyncio coroutines/tasks, every 200ms, 300ms, 400ms respectively.

What is interesting is that gauges are not as synchronised as I would expect.  i.e. gauge 1 and  2 should end exactly the same time, every 200ms, and gauge 4 should also end at the same time as gauge 1 and 2 every 400ms, but they are out.  It might be my count reset logic is out by 1?

Brendan.

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[Marco Prosperi]

never tried with asyncio but maybe you can get hints from this wxpython+gevent example

https://github.com/tfmoraes/samples/blob/master/WX/wx_gevent.py


On Sunday, March 12, 2017 at 8:02:45 AM UTC+1, Brendan Simon wrote:

I'm playing with MicroPython using asyncio coroutines to do some tasks
(e.g. scan a 4x4 keypad matrix and display stuff on a LCD).

I want to also be able to simulate my environment using wxPython Phoenix
to provide fake LCD and Keypad.

How can I use wxPython Phoenix with Python 3.5/3.7 asyncio
functionality, so that I can run the coroutines and also hand GUI events?

I've searched high and low for info but no hits.

Would it be something as simple as the following?  I'm thinking there
must be some more magic involved.

    ## wx application
    wxapp = MyWxApp(False)

    ## Get a handle to the asyncio event loop.
    loop = asyncio.get_event_loop()

    ## Add coroutines to the event loop.
    loop.create_task( keypad_scanner_coro() )
    loop.create_task( keypad_watcher_coro() )
    loop.create_task( wxapp.MainLoop() )

    ## Start running the coroutines
    loop.run_forever()

Thanks, Brendan.

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[tcab]

Possibly try https://github.com/sirk390/wxasync

wxasync it a library for using python 3 asyncio (async/wait) with wxpython. It does GUI message polling every 5ms and runs the asyncio message loop the rest of the time.

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