[Python-Dev] Re: anonymous blocks

Bob Ippolito bob at redivi.com
Thu Apr 21 13:04:45 CEST 2005

On Apr 21, 2005, at 6:28 AM, Fredrik Lundh wrote:

> Glyph Lefkowitz wrote:
>> Despite being guilty of propagating this style for years myself, I 
>> have to disagree.  Consider the
>> following network-conversation using Twisted style (which, I might 
>> add, would be generalizable to
>> other Twisted-like systems if they existed ;-)):
>> 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.  If they did, then this use case could be mostly served by 


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