[PyQt] Integrating asyncio with Qt event loop?

[Arve Knudsen]

Great to hear. Bare hyggelig, Erik :)

Arve


On Fri, Aug 8, 2014 at 12:13 AM, Erik Hvatum <ice.rikh at gmail.com> wrote:

> Brilliant!  Works like a charm; our code
> <https://github.com/erikhvatum/zplab/blob/68328cb37289bdf94ae0b10d4dc5e9583578934d/acquisition/dm6000b/function_units/objective_turret.py>
> is going to get a lot cleaner.
>
> Tusen takk,
> Erik
>
>
> On Thu, Aug 7, 2014 at 4:29 PM, Arve Knudsen <arve.knudsen at gmail.com>
> wrote:
>
>> Hi Erik
>>
>> I think you could use an asyncio.Future for this purpose. You can yield
>> from the Future, and set its result upon arrival of the signal. I've
>> concocted an example program that should show what I mean; it creates a
>> 2-second timer which is waited on asynchronously, once its timeout fires
>> the program exits:
>>
>>     import quamash
>>     import asyncio
>>     from PyQt5.QtWidgets import *
>>     from PyQt5.QtCore import *
>>
>>
>>     @asyncio.coroutine
>>     def _go():
>>         def on_timeout():
>>             print('Timeout')
>>             fut.set_result(True)
>>
>>         fut = asyncio.Future()
>>         timer = QTimer()
>>         timer.setSingleShot(True)
>>         timer.setInterval(2000)
>>         timer.start()
>>         timer.timeout.connect(on_timeout)
>>         print('Yielding until signal...')
>>         yield from fut
>>         print('Continuing execution after yield from')
>>
>>     with quamash.QEventLoop(app=QApplication([])) as loop:
>>         w = QMainWindow()
>>         w.show()
>>         loop.run_until_complete(_go())
>>     print('Coroutine has ended')
>>
>> HTH,
>> Arve
>>
>>
>> On Thu, Aug 7, 2014 at 12:31 AM, Erik Hvatum <ice.rikh at gmail.com> wrote:
>>
>>> Thank you :)
>>>
>>> A quick question to help as I dig into this: how might one go about
>>> "yield from wait_for_a_qt_signal"?  That is, I want my coroutine to resume
>>> execution when some certain signal is emitted.  Perhaps this desire
>>> indicates that I'm going about things the wrong way...
>>>
>>> -Erik
>>>
>>> PS: forgot to reply to the list the first time around
>>>
>>>
>>> On Sat, Jul 5, 2014 at 12:34 PM, Arve Knudsen <arve.knudsen at gmail.com>
>>> wrote:
>>>
>>>> Quamash, in the unix branch (
>>>> https://github.com/aknuds1/quamash/tree/unix), now works perfectly for
>>>> thread and subprocess execution on OS X, Linux and Windows, I'm pleased to
>>>> say. Would love some feedback.
>>>>
>>>> Arve
>>>>
>>>>
>>>> On Tue, Jul 1, 2014 at 3:12 PM, Arve Knudsen <arve.knudsen at gmail.com>
>>>> wrote:
>>>>
>>>>> Now, even subprocess execution works. At least on Windows/PyQt,
>>>>> haven't tested on other platforms.
>>>>>
>>>>> Arve
>>>>>
>>>>>
>>>>> On Mon, Jun 30, 2014 at 4:03 PM, Arve Knudsen <arve.knudsen at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> Erik, Tamás, feel free to try my Quamash fork
>>>>>> <https://github.com/aknuds1/quamash>, it's currently quite
>>>>>> functional, except that subprocess execution is somehow broken.
>>>>>>
>>>>>> Arve
>>>>>>
>>>>>> On Fri, Jun 27, 2014 at 1:34 PM, Arve Knudsen <arve.knudsen at gmail.com
>>>>>> > wrote:
>>>>>>
>>>>>>> My fork is now semi-functional with Python 3.4 and PyQt 5. I can at
>>>>>>> least perform simple asynchronous tasks within a Qt application, but lots
>>>>>>> remain to implement.
>>>>>>>
>>>>>>> Arve
>>>>>>>
>>>>>>>
>>>>>>> On Fri, Jun 27, 2014 at 9:24 AM, Arve Knudsen <
>>>>>>> arve.knudsen at gmail.com> wrote:
>>>>>>>
>>>>>>>> I've created a fork on GitHub: https://github.com/aknuds1/quamash.
>>>>>>>> Do you know where to locate information on writing an asyncio event loop
>>>>>>>> though? Not sure where to begin.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Arve
>>>>>>>>
>>>>>>>>
>>>>>>>> On Thu, Jun 26, 2014 at 9:30 PM, Arve Knudsen <
>>>>>>>> arve.knudsen at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Thanks. I'm thinking I might try to modify his code, if it isn't
>>>>>>>>> too much work.
>>>>>>>>>
>>>>>>>>> Arve
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Thu, Jun 26, 2014 at 7:32 PM, Tamás Bajusz <gbtami at gmail.com>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>>> Unfortunately, I know that github project only. (
>>>>>>>>>> https://github.com/harvimt/quamash)
>>>>>>>>>> Try to contact him at mark.harviston at gmail.com
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Thu, Jun 26, 2014 at 7:27 PM, Arve Knudsen <
>>>>>>>>>> arve.knudsen at gmail.com> wrote:
>>>>>>>>>>
>>>>>>>>>>> Tamás, has Mark Harviston's implementation been updated to work
>>>>>>>>>>> with the latest Python (3.4)? I think I read somewhere that it's based on
>>>>>>>>>>> an outdated API.
>>>>>>>>>>>
>>>>>>>>>>> Arve
>>>>>>>>>>>
>>>>>>>>>>> On Thu, Jun 26, 2014 at 6:29 PM, Tamás Bajusz <gbtami at gmail.com>
>>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> http://haypo-notes.readthedocs.org/asyncio.html#replacing-the-event-loop
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Thu, Jun 26, 2014 at 5:20 PM, Arve Knudsen <
>>>>>>>>>>>> arve.knudsen at gmail.com> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>>  Hi guys
>>>>>>>>>>>>>
>>>>>>>>>>>>> I am looking to integrate Python 3.4 asyncio
>>>>>>>>>>>>> <https://docs.python.org/3/library/asyncio.html> with Qt's
>>>>>>>>>>>>> event loop (via PyQt 5), specifically in order to asynchronously monitor
>>>>>>>>>>>>> output (stdout/stderr) from a child process. Maybe this is somewhat
>>>>>>>>>>>>> off-topic for this list, but can someone tell me if such integration exists
>>>>>>>>>>>>> (and works)?
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>> Arve
>>>>>>>>>>>>>
>>>>>>>>>>>>> _______________________________________________
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>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
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>>
>>
>
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