[Tutor] How to extract numerator and denominator from fractions.Fraction(4, 32)?

[Alan Gauld]

On 06/08/13 08:16, Jim Mooney wrote:

>>     class IterableFraction(Fraction):
>>        def __iter__(self):
>>            yield self.numerator
>>            yield self.denominator

> Seriously, though, I thought yield was like return - one and you're
> done - how are you getting two yields in there?

yield acts like a return but also a freeze frame.
So the first time you call the function it runs till it hits yield. The 
next time you call the function it picks up at the yield and continues 
from that point. In this case to the next yield.

The usual paradigm is to have the yield inside a loop such that every 
call returns the next result of a loop. You could do that here too but 
its shorter to use 2 yields:

def __iter__(self):
   for value in [self.numerator, self.denominator]
     yield value


hth

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/