[Python-Dev] Dropping decorator syntax for 2.4?
Guido van Rossum
guido at python.org
Fri Jun 4 10:17:27 EDT 2004
> I don't recall Guido's patch. Did he modify the grammar or can it
> all be done inside the compiler?
The parser generator is too weak to allow a grammar change to work, so
I did it in the compiler.
> Not that it's practical for 2.4, but I
> think it wouldn't be hard to post-process the existing AST to
> recognize decorators written like this.
> You'd like for adjacent statements of the form:
> and replace them with a single
> Or do we need to catch Expr(ListComp()) too? PEP 318 doesn't mention
> semantics anywhere, so it doesn't say what is allowed inside the
> square brackets.
My patch excludes list comprehensions, because I need to know the
number of elements of the list for the code I generate. The PEP
should be disambiguated to disallow list comps.
(I see no merit to the import hook + bytecode hack approach.)
--Guido van Rossum (home page: http://www.python.org/~guido/)
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