On Tue, 05 May 2009 13:43:32 -0400, J. Cliff Dyer wrote:
> On Fri, 2009-05-01 at 13:00 -0400, John Posner wrote:
>> Shane Geiger wrote:
>> > if type(el) == list or type(el) is tuple:
>> A tiny improvement:
>>
>> if type(el) in (list, tuple):
>>
>>
> Another alternative, which might be useful in some cases:
>
> if hasattr(el, '__iter__'):
>
> This covers all iterables, not just lists and tuples.
Except for the ones that it doesn't cover, like strings:
>>> hasattr('abcd', '__iter__')
False
>>> list(iter('abcd'))
['a', 'b', 'c', 'd']
And classes that follow the sequence protocol:
>>> class Spam:
... def __getitem__(self, index):
... if 0 <= index < 5:
... return "spam"
... raise IndexError
...
>>> hasattr(Spam(), '__iter__')
False
>>> list(iter(Spam()))
['spam', 'spam', 'spam', 'spam', 'spam']
--
Steven
--
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