Supply condition in function call

[Dave Angel]

On 03/26/2015 09:41 PM, Rustom Mody wrote:
> On Thursday, March 26, 2015 at 11:30:57 AM UTC+5:30, Chris Angelico wrote:
>>
>>
>> Python 3.5.0a0 (default:4709290253e3, Jan 20 2015, 21:48:07)
>> [GCC 4.7.2] on linux
>>
>> class filter(object)
>>   |  filter(function or None, iterable) --> filter object
>>   |
>>   |  Return an iterator yielding those items of iterable for which function(item)
>>   |  is true. If function is None, return the items that are true.
>>   |
>>   |  Methods defined here:

...

> On a more specific note, its the 1st line:
>
> class filter(object)
>
> which knocks me off.
> If a more restricted type from the ABC was shown which exactly captures all
> the iterator-specific stuff like __iter__, __next__ it would sure help (me)
>

Since it's not actually derived from anything else, I'd leave that part 
alone.  But it could be useful to add something like:

ducktype: collections.abc.Iterable

if nothing else, it'd get beginners to the language to start thinking 
more of what duck typing is, in Python.

-- 
DaveA