[Python-Dev] Tricky way of of creating a generator via a comprehension expression

[Ivan Levkivskyi]

On 23 November 2017 at 09:15, Greg Ewing <greg.ewing at canterbury.ac.nz>
wrote:

> Ivan Levkivskyi wrote:
>
>> On 23 November 2017 at 05:44, Greg Ewing <greg.ewing at canterbury.ac.nz
>> <mailto:greg.ewing at canterbury.ac.nz>> wrote:
>>
>>        def g():
>>           return ((yield i) for i in range(10))
>>
>>
>> I think this code should be just equivalent to this code
>>
>>     def g():
>>         temp = [(yield i) for i in range(10)]
>>         return (v for v in temp)
>>
>
> But then you get a non-lazy iterable, which defeats the
> purpose of using a generator expression -- you might as
> well have used a comprehension to begin with.
>
>
This could be just a semantic equivalence (mental model), not how it should
be internally implemented.

--
Ivan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20171123/790c5c4f/attachment.html>