[Python-Dev] Tricky way of of creating a generator via a comprehension expression
Ivan Levkivskyi
levkivskyi at gmail.com
Thu Nov 23 03:19:54 EST 2017
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Thu Nov 23 03:19:54 EST 2017
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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>
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