Other notes

[Mike Meyer]

Steve Holden <steve at holdenweb.com> writes:

> Mike Meyer wrote:
>
>> bearophileHUGS at lycos.com writes:
>>
>>>@infix
>>>def interval(x, y): return range(x, y+1) # 2 parameters needed
>>>
>>>This may allow:
>>>assert 5 interval 9 == interval(5,9)
>> I don't like the idea of turning words into operators. I'd much
>> rather
>> see something like:
>> @infix('..')
>> def interval(x, y):
>>     return range(x, y + 1)
>> assert 5 .. 9 == interval(5, 10)
>> This would also allow us to start working on doing away with the
>> magic
>> method names for current operators, which I think would be an
>> improvement.
>>
> 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.

  <mike
-- 
Mike Meyer <mwm at mired.org>			http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.