[Python-Dev] Re: Re: anonymous blocks

Fredrik Lundh fredrik at pythonware.com
Thu Apr 21 15:11:23 CEST 2005

Bob Ippolito wrote:

>>> def strawman(self):
>>>     def sayGoodbye(mingleResult):
>>>         def goAway(goodbyeResult):
>>>             self.loseConnection()
>>>         self.send("goodbye").addCallback(goAway)
>>>     def mingle(helloResult):
>>>         self.send("nice weather we're having").addCallback(sayGoodbye)
>>>     self.send("hello").addCallback(mingle)
>>     def iterman(self):
>>         yield "hello"
>>         yield "nice weather we're having"
>>         yield "goodbye"
> Which, more or less works, for a literal translation of the straw-man above.  However, you're 
> missing the point.  These deferred operations actually return results.  Generators offer no sane 
> way to pass results back in.

that's why you need a context object (=self, in this case).

    def iterman(self):
        yield "hello"
        print self.data
        yield "nice weather we're having"
        print self.data
        yield "goodbye"

also see:


> If they did, then this use case could be mostly served by generators.



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