On 22 November 2017 at 17:24, Antoine Pitrou <solip...@pitrou.net> wrote:
> On Wed, 22 Nov 2017 17:08:14 +0100 > Ivan Levkivskyi <levkivs...@gmail.com> wrote: > > On 22 November 2017 at 16:56, Yury Selivanov <yselivanov...@gmail.com> > > wrote: > > > > > On Wed, Nov 22, 2017 at 10:10 AM, Ivan Levkivskyi < > levkivs...@gmail.com> > > > wrote: > > > > On 22 November 2017 at 15:47, Paul Moore <p.f.mo...@gmail.com> > wrote: > > > [...] > > > I'm all for prohibiting using 'yield' expression in generator > > > expressions or comprehensions. The semantics is way to hard to > > > understand and hence be of any value. > > > > > > Making 'await' a SyntaxError is absolutely not an option. Async > > > generator expressions are a shorthand syntax for defining asynchronous > > > generators (PEP 525), and it's already being used in the wild. > > > > > > > OK, makes sense, so it looks like we may have the following plan: > > > > - fix `yield` in comprehensions > > - update PEP 530 and docs re generator expressions vs comprehensions > > - make `yield` in generator expressions a SyntaxError > > Given a comprehension (e.g. list comprehension) is expected to work > nominally as `constructor(generator expression)` > As Yury just explained, these two are not equivalent if there is an `await` in the comprehension/generator expression. -- Ivan
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