[Tutor] How does this work (iterating over a function)?

[steve10brink at comcast.net]

----- Original Message -----

I guess my higher level question is: "what makes this function iterable?" and the answer appears to be the fact that it 
uses a generator instead of a return function. Is that correct? 


-Steve Tenbrink 

---------------------------------------------------------------------- 

Message: 1 
Date: Wed, 9 Jul 2014 16:24:46 +0100 
From: Ra?l Cumplido <raulcumplido at gmail.com> 
To: steve10brink at comcast.net 
Cc: tutor <tutor at python.org> 
Subject: Re: [Tutor] How does this work (iterating over a function)? 
Message-ID: 
<CAD1Rbrou1hDfxkBeJcB97361uwyNYq8tW7REk=mhUaVjeNNk2g at mail.gmail.com> 
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Hi, 

A little bit more on this :) 

Python iterator protocol will call the next() method on the iterator on 
each iteration and receive the values from your iterator until a 
StopIteration Exception is raised. This is how the for clause knows to 
iterate. In your example below you can see this with the next example: 

>>> gen = fibonacci(3) 
>>> gen.next() 
0 
>>> gen.next() 
1 
>>> gen.next() 
1 
>>> gen.next() 
2 
>>> gen.next() 
Traceback (most recent call last): 
File "<stdin>", line 1, in <module> 
StopIteration 
>>> 

Thanks, 
Ra?l 





-- 
Ra?l Cumplido 
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