Stop python
Steve Holden
sholden at holdenweb.com
Mon Apr 16 22:09:13 EDT 2001
"Ken Seehof" <kens at sightreader.com> wrote ...
> Hey, this reminds me of a useless python idea I had a few years ago.
>
> First write a streaming preprocessor for python. Make a fancy
> importer that makes *.py dependent on *.ppy the same way *.pyc
> is dependent on *.py. Then add a preprocessor command "exit()".
>
> # example.ppy
> print 'hello',
> #!x=5
> #!if x==5:
> #! print "print 'lumberjacks.'"
> #! exit()
> print 'world.'
>
> This would be a fun project that I don't have time for. Any idea why
> it would be useful? I might be willing to coauthor it if someone else
> wants to do the import logic (custom importers make my head hurt).
>
> Of course it's most likely useless since python's a bit too dynamic to
> really -need- a proprocessor, but I could be missing something.
>
> In case you are confused:
> The preprocessor copies lines that don't start with "#!".
> The preprocessor executes lines that start with "#!".
> The print statement (stdout) is redirected to preprocessor output.
>
> David V. wrote:
> > Is it possible to stop parsing python program at some point, for
> > example, like in shell script using 'exit'?
>
This was actually a useless PL/1 idea a long time before Python existed.
regards
Steve
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