[Python-Dev] Acquire/release functionality (Was: Extended Function syntax) (original) (raw)

Walter D�rwald walter@livinglogic.de
Mon, 03 Feb 2003 14:35:50 +0100

holger krekel wrote:

[...] you probably missed my other posting where i actually went one step further and implemented this via <...> syntax.

I saw it. I actually took a look at your IEXEC patch, where this XML stuff is one of your use cases.

Compared to the patch, which uses sys._getframe(1).f_locals['icontent'] to get at the content nodes I like the catch idea much better. But I find your syntax to be too unpythonic.

Actually i tried exactly the syntax you propose here first but i think it's hopelessly ambigous with the Python grammar.

You simple have no way to know which construct you are in until you read the ':'. Until then you could be in a normal expression. The 'class', 'def', 'if', 'while' etc. keywords disambiguate this right at the beginning. Without a much deeper parser look-ahead this can't be done, i am afraid.

You're right, but my point is that in this XML case the new block feature is used so often that an additional keyword might be too much typing overhead.

Bye, Walter D�rwald