Nope Joel, that's what I meant. Remember EAFP over LBYL! I'm not sure the best
way to make sure the object is iterable though.
Sent from my iPhone
On Sep 9, 2010, at 11:41 AM, Joel Goldstick <joel.goldst...@gmail.com> wrote:
>
>
> On Thu, Sep 9, 2010 at 12:07 PM, Steven D'Aprano <st...@pearwood.info> wrote:
> On Fri, 10 Sep 2010 01:05:22 am Joel Goldstick wrote:
> > On Thu, Sep 9, 2010 at 10:26 AM, Luke Paireepinart
> >
> > <rabidpoob...@gmail.com>wrote:
> > > Shouldn't there be a way to do this without type checking? Duck
> > > typing!
> > >
> > > Your post got me thinking. Maybe better to test if the object can
> > > return
> > an iter method. If it throws an error, then look at its value. If
> > it doesn't, then its a list or a tuple
>
>
> It's not clear what you mean by "return an iter method". Taken
> literally, that would imply the object is a function. I think you
> mean "*has* an iter method" -- except that's not right either:
>
> >>> [].iter
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> AttributeError: 'list' object has no attribute 'iter'
>
>
> Perhaps you mean an object which can be passed to iter(), but lots of
> objects can do that, not just lists and tuples:
>
> >>> iter("not a list or tuple")
> <str_iterator object at 0xb7d3520c>
> >>> iter({1: None, 2: "a", 4: 5})
> <dict_keyiterator object at 0xb7d3420c>
>
>
> I was googling, and found that if an object has an __iter__ method it will
> return it. If not it will throw an error. You are right about more than
> lists and tuples being iterable. But, in this thread, it was brought up that
> checking type may not be pythonic. If you wanted to use the same code to
> find values in a nested list of any objects, you could dispense with the type
> checking and just see if it is iterable.
>
> I'm new to python. Am I off base?
>
>
> --
> Steven D'Aprano
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>
> --
> Joel Goldstick
>
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