[Python-Dev] Re: anonymous blocks
jim at zope.com
Wed Apr 27 13:42:07 CEST 2005
Guido van Rossum wrote:
> I've written a PEP about this topic. It's PEP 340: Anonymous Block
> Statements (http://python.org/peps/pep-0340.html).
> Some highlights:
> - temporarily sidestepping the syntax by proposing 'block' instead of 'with'
> - __next__() argument simplified to StopIteration or ContinueIteration instance
> - use "continue EXPR" to pass a value to the generator
> - generator exception handling explained
This looks pretty cool.
1. It looks to me like a bare return or a return with an EXPR3 that happens
to evaluate to None inside a block simply exits the block, rather
than exiting a surrounding function. Did I miss something, or is this
2. I assume it would be a hack to try to use block statements to implement
something like interfaces or classes, because doing so would require
significant local-variable manipulation. I'm guessing that
either implementing interfaces (or implementing a class statement
in which the class was created before execution of a suite)
is not a use case for this PEP.
Jim Fulton mailto:jim at zope.com Python Powered!
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