> Sorry, your code example and your explanation don’t make clear what
> you expect to happen, and when. When you say “the first method that
> is called from my code”, are you referring to aSillyBlockingMethod,
> or runEverySecond? In the deferToThread case, you are calling the
> former; in the task.LoopingCall case, you are calling the latter.
Ah youre right, i forgot to write about the most important part.
if the datetime line is wrong you get
Unhandled Error
i was looking for a way to get the original error message that:
print(datetime.now().strftime('%H:%M:%S'))
throws if used outside of twisted code.
i know how to correct the code but i would like to know why i dont get
that error on the console.
> If your intent is to trigger the strftime exception as a consequence
> of your call to deferToThread, then you would need to either add
> runEverySecond to the callback chain, or move the call to strftime
> into the aSillyBlockingMethod call.
>
> Example:
>
> # this will "sleep" for x seconds
> d = threads.deferToThread(aSillyBlockingMethod, 'some argument’)
> d.addCallback(runEverySecond)
> d.addCallback(printResult)
> d.addErrback(printError)
>
i tried that one, code looks like this. but i dont get the error
message...still Unhandled error in Deferred
from twisted.internet import reactor, task, threads
import datetime
def aSillyBlockingMethod(x):
import time
time.sleep(4)
return x
def runEverySecond(ignored):
print(datetime.now().strftime('%H:%M:%S')) #WRONG, ERROR:
AttributeError: 'module' object has no attribute 'now'
# that error gets eaten by twisted....why?
#print(datetime.datetime.now().strftime('%H:%M:%S')) #WORKS
def printResult(result):
print("printResult:", result)
def printError(failure):
print(failure)
# this will "sleep" for x seconds
d = threads.deferToThread(aSillyBlockingMethod, 'some argument')
d.addCallback(runEverySecond)
d.addCallback(printResult)
d.addErrback(printError)
# but this will still run, not getting blocked
l = task.LoopingCall(runEverySecond, 'lala')
l.start(1.0)
reactor.callLater(5, reactor.stop)
reactor.run()
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