[Python-ideas] non-Pre-PEP: Syntactic replacement of built-in typeswith user-defined callables (Take 2... fewer newlines!)
tjreedy at udel.edu
Wed Jan 30 04:01:57 CET 2008
"Taro" <taroso at gmail.com> wrote in message
news:fefcdfb70801272201y10d57ebdo39d559ca5bc6e8a2 at mail.gmail.com...
| Theoretical Performance Differences: Since a typedef is purely
| syntactic sugar, and all tranformational work would be done at
I think this is a key issue which, unfortunately, I believe, works against
your proposal. If the alternative constructor is a builtin C function,
then yes, the transformation could be done at compile time. But I think
this much more difficult for one written in Python. As far as I know, the
byte-code interpreter is not normally running during compilation. From
__future__ imports work precisely because they are not really imports. But
alternate constructor imports would have to be. I don't know enough,
though, to know if this could be made to work.
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