On Wed, Nov 30, 2016 at 02:32:54PM -0600, Nick Timkovich wrote:
> a generator with known length that's not indexable (a rare beast?).
Not as rare as you might think:
>>> k = set(range(10))
>>> len(k)
10
>>> k[3]
Traceback (most recent call last):
File "", line 1, in
TypeError: 'set' object
On Wed, Nov 30, 2016 at 11:57:46AM -0800, Chris Kaynor wrote:
> Consider that this code will not produce the "correct" results (for a
> reasonable definition of correct):
>
> a = (i for i in range(100)) # Pretend this does something more
> interesting, and isn't a trivial generator - maybe a
On 2016-11-30 19:11, Chris Kaynor wrote:
All that said, I would not be opposed to Python including a
random.reservoir_choice (probably not the best name) function *in
addition* to random.choice. The algorithm has its uses, but enough
drawbacks and gotchas that it likely is not a good candidate
On Wed, Nov 30, 2016 at 12:21 PM, Bernardo Sulzbach
wrote:
> On 2016-11-30 17:57, Chris Kaynor wrote:
>>
>> On Wed, Nov 30, 2016 at 11:52 AM, Chris Kaynor
>> wrote:
>>>
>>> There are also issues with how it should behave on iterables that
>>>
Is the goal to allow them to consume a finite generator of *unknown* length
(requires reservoir sampling
https://en.wikipedia.org/wiki/Reservoir_sampling with N random calls,
which seemed to be the rub before?) or just consume a generator with known
length that's not indexable (a rare beast?).
On 2016-11-30 17:57, Chris Kaynor wrote:
On Wed, Nov 30, 2016 at 11:52 AM, Chris Kaynor wrote:
There are also issues with how it should behave on iterables that
cannot be re-iterated (eg, random.choice will consume the iterator,
and could only be called once safely).
On Wed, Nov 30, 2016 at 11:52 AM, Chris Kaynor wrote:
> There are also issues with how it should behave on iterables that
> cannot be re-iterated (eg, random.choice will consume the iterator,
> and could only be called once safely).
I meant to include a sample in my
This was also brought up back in April:
https://mail.python.org/pipermail//python-ideas/2016-April/039707.html
It got a few replies from Guido
(https://mail.python.org/pipermail//python-ideas/2016-April/039713.html
for one of them).
It seems the idea got dropped due to problems with making it
On 2016-11-30 17:25, Random832 wrote:
Currently these functions fail if the supplied object has no len().
There are algorithms for this task that can work on any finite iterator
(for example, files as a stream of lines), and the functions could fall
back to these if there is no len().
I like
Currently these functions fail if the supplied object has no len().
There are algorithms for this task that can work on any finite iterator
(for example, files as a stream of lines), and the functions could fall
back to these if there is no len().
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