On 15 Jan., 02:13, Paul Rubin <http://[EMAIL PROTECTED]> wrote: > George Sakkis <[EMAIL PROTECTED]> writes: > > What's the best way to simulate dynamically scoped variables ala Lisp ? > > Ugh.... check the docs for the python 2.5 "with" statement, which > gives you sort of a programmable unwind-protect (more powerful than > try/except). You'd have an environment dictionary and use the "with" > statement to maintain a stack of shallow-binding cells like in an > old-time lisp system, automatically unwinding when the "with" suite > finishes. The whole concept sounds hopelessly crufty--I think nobody > even does it that way in Lisp any more, you're better off passing an > environment around explicitly. If there were a lot of variables, this > could be a good application for functional maps, which I've been wanting > to implemetn for python.
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