Gabriel Genellina wrote:
>> I now would also like to add the possibility to allow the user to
>> *cancel* the execution of foo() during the processing, and I am
>> wondering what the best / most Pythonic way to design this is.
>
> I can't say if this is the "best/more Pythonic way", but a simple way
> would be to use the return value from your callback. Consider it an
> "abort" function: if it returns True, cancel execution; as long as it
> returns False, keep going.
It's even easier if the callback function simply raise an exception, which can
be caught from the outside:
class AbortOperationError(RuntimeError):
pass
def callback(N):
updateProgressBar(N)
processGUIEvents()
if exit_button_pressed:
raise AbortOperationError()
try:
longFunction(callback)
except AbortOperationError()
pass
def longFunction(callback):
for i in xrange(1000000000):
# do something
callback(i / 1000000000.0)
--
Giovanni Bajo
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