[Python-ideas] x=(yield from) confusion [was:Yet another alternative name for yield-from]

Nick Coghlan ncoghlan at gmail.com
Fri Apr 10 16:57:04 CEST 2009

Greg Ewing wrote:
> Nick Coghlan wrote:
>>>>> class Tricky(object):
>> ...   def __iter__(self):
>> ...     return self
>> ...   def next1(self):
>> ...     print "Next 1"
>> ...     Tricky.next = Tricky.next2
> I just tried using a class like that in a for loop, and
> it doesn't work. The next() method has to be defined in
> the class, because it's actually a special method (it
> has a slot in the type object).

Note that my example actually *does* modify the class as it goes along
(for exactly the reason you give - next() has to be defined on the class
or the interpreter will ignore it).

Is it possible you assigned to "self.next" instead of to "Tricky.next"
when trying it out?


Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia

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