[Python-ideas] Generator syntax hooks?

[Soni L.]

On 2017-08-10 01:11 PM, Steven D'Aprano wrote:
> On Thu, Aug 10, 2017 at 12:39:34PM -0300, Soni L. wrote:
>
>> I'm pretty sure I read somewhere that lambdas and generators share their
>> syntax, and that syntax is already a subset of python syntax. Would it
>> be too hard to expose that with a "simplified AST" API?
> I don't understand what you mean by this.
>
> The syntax for lambda is (roughly):
>
>       lambda parameter-list : expression
>
> The syntax for generators is (again, roughly):
>
>       def name ( parameter-list ) :
>           suite-containing-yield
>
>
> Obviously the generator suite can contain expressions, and both have a
> parameter-list. What shared syntax are you referring to, and how is it
> relevant?
>
> Or are you referring to generator expressions, rather than generators?
>
>       ( expression for target in expression ... )
>
> Obviously a Python expression is a Python expression, wherever it is, so
> a lambda can contain generator expressions, and generator expressions
> can contain lambdas...
>
> And what do you mean by "simplified AST" API? I'm afraid your comment is
> too abstract for me to understand.
>

Yes, see, both are expressions. Expression AST is a subset of python 
AST, so it's a simplified form of the python AST.

>