On 12/1/2016 3:19 AM, Sjoerd Job Postmus wrote:
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?).
I don't believe a generator is ever indexable.
Not as rare as you might think:
k = set(range(10))
len(k)
10
k[3]
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'set' object does not support indexing
It is also not a generator. (It is an iterable.). If an *arbitrary*
choice (without replacement) from a set is sufficient, set.pop() works.
Otherwise, make a list. If we wanted selection selection from sets to
be easy, without making a list, we should add a method that accesses the
internal indexable array.
--
Terry Jan Reedy
_______________________________________________
Python-ideas mailing list
Python-ideas@python.org
https://mail.python.org/mailman/listinfo/python-ideas
Code of Conduct: http://python.org/psf/codeofconduct/
