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.
Some observations:
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
a bug?
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
--
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