On Sep 12, 8:08 pm, [EMAIL PROTECTED] wrote:
> First off, I'm a python n00b, so feel free to comment on anything if
> I'm doing it "the wrong way." I'm building a discrete event simulation
> tool. I wanted to use coroutines. However, I want to know if there's
> any way to hide a yield statement.
>
> I have a class that I'd like to look like this:
>
> class Pinger(Actor):
> def go(self):
> success = True
> while success:
> result = self.ping("128.111.41.38")
> if result != "success":
> success = False
> print "Pinger done"
>
> But because I can't hide yield inside ping, and because I can't find a
> convenient way to get a self reference to the coroutine (which is used
> by the event queue to pass back results), my code looks like this:
>
> class Pinger(Actor):
> def go(self):
> # I dislike this next line
> self.this_pointer = (yield None)
> success = True
> while success:
> # I want to get rid of the yield in the next line
> result = (yield self.ping("128.111.41.38"))
> if result != "success":
> success = False
> print "Pinger done"
>
> I posted a more detailed version of this as a rant
> here:http://illusorygoals.com/post/49926627/
>
> I'd like to know, is there a way to get the syntax I want? After
> staying up late last night to get a proof-of-concept working with
> coroutines, my boss expressed disappointment in the ugliness of the
> Pinger code (we agreed on the desired syntax above). I spent almost 2
> hours today to migrate the system over to threads. That made my boss
> happy, but I'm still curious if I can do something to salvage the
> coroutine version.
>
> Regards,
> IG
I did not read you whole post though I did skim your link. I don't
know your whole problem but it seems you are trying to inform a
generator of its own identity. Here's a solution to that problem;
perhaps it relates to yours. (The shorter retort is, "Just use
closures.")
def gen( ):
def _gen( ):
while 1:
yield 1, 'i am %r'% ob
yield 2, 'i am %r'% ob
yield 3, 'i am %r'% ob
ob= _gen( )
return ob
gens= [ gen( ) for _ in range( 4 ) ]
for i in range( 6 ):
print i
for g in gens:
print g.next( )
/Output (lengthy):
0
(1, 'i am <generator object at 0x009FEC10>')
(1, 'i am <generator object at 0x009FEC38>')
(1, 'i am <generator object at 0x009FEC60>')
(1, 'i am <generator object at 0x009FEC88>')
1
(2, 'i am <generator object at 0x009FEC10>')
(2, 'i am <generator object at 0x009FEC38>')
(2, 'i am <generator object at 0x009FEC60>')
(2, 'i am <generator object at 0x009FEC88>')
2
(3, 'i am <generator object at 0x009FEC10>')
(3, 'i am <generator object at 0x009FEC38>')
(3, 'i am <generator object at 0x009FEC60>')
(3, 'i am <generator object at 0x009FEC88>')
3
(1, 'i am <generator object at 0x009FEC10>')
(1, 'i am <generator object at 0x009FEC38>')
(1, 'i am <generator object at 0x009FEC60>')
(1, 'i am <generator object at 0x009FEC88>')
4
(2, 'i am <generator object at 0x009FEC10>')
(2, 'i am <generator object at 0x009FEC38>')
(2, 'i am <generator object at 0x009FEC60>')
(2, 'i am <generator object at 0x009FEC88>')
5
(3, 'i am <generator object at 0x009FEC10>')
(3, 'i am <generator object at 0x009FEC38>')
(3, 'i am <generator object at 0x009FEC60>')
(3, 'i am <generator object at 0x009FEC88>')
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