Other notes

Terry Reedy tjreedy at udel.edu
Wed Dec 29 21:19:50 CET 2004


"Mike Meyer" <mwm at mired.org> wrote in message 
news:86acrxt0e7.fsf at guru.mired.org...
> Steve Holden <steve at holdenweb.com> writes:
>> Well, perhaps you can explain how a change that's made at run time
>> (calling the decorator) can affect the parser's compile time behavior,
>> then. At the moment, IIRC, the only way Python code can affect the
>> parser's behavior is in the __future__ module, which must be imported
>> at the very head of a module.
>
> By modifying the parsers grammer at runtime. After all, it's just a
> data structure that's internal to the compiler.

Given that xx.py is parsed in its entirety *before* runtime, that answer is 
no answer at all.  Runtime parser changes (far, far from trivial) could 
only affect the result of exec and eval.

Terry J. Reedy






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