[Twisted-Python] running code on its own and importing, howto install a different reactor?

[steven meier]

On Fri, 2016-07-29 at 23:11 +0400, meejah wrote:
> I think the "recommended" way to get access to a reactor instance is to
> pass it in to methods that require it.
> 
> While this can sometimes seem tedious it a) helps testing (because now
> you can easily pass a fake reactor object like Clock or a Mock instance)
> and b) shows you (and your users) which methods are (or might-be) async.
> 
> So, try a signature like "def terrific_method(reactor):" instead. Now
> when you're writing tests, you can do this:
> 
>     fake_reactor = Clock()
>     d = terrific_method(fake_reactor)
>     fake_reactor.advance(2)
>     # etc.
> 


Ah yes, you answered a question of mine not so long ago earlier and told
me exactly that....sorry forgot.

workig  example if anybody ever digs this out:

i modified the code like this:




working_code.py
from twisted.internet.defer import inlineCallbacks, Deferred,
returnValue

@inlineCallbacks
def print_it(reactor):
    arg = yield terrific_method(reactor)
    print arg


@inlineCallbacks
def terrific_method(reactor):
    d = Deferred()
    reactor.callLater(2, d.callback, 2)
    result = yield d
    returnValue(result)




if __name__ == '__main__':
    import qt5reactor
    qt5reactor.install()
    from twisted.internet import reactor
    reactor.callWhenRunning(print_it, reactor)
    reactor.run()





main_code.py:
import qt5reactor
qt5reactor.install()

from twisted.internet import reactor
from working_code import print_it


print_it(reactor)
reactor.run()




now on to some tests...