empy 1.3 -- Embed Python in template text as markup
Erik Max Francis
max at alcyone.com
Mon Aug 26 02:33:47 EDT 2002
Neil Hodgson wrote:
> Further expansions yield the same result with the same f or
> equivalent
> results with updated f.
I see what you're getting at now. It seems straightforward enough that
I don't see much reason _not_ to implement it, but am not sure what
general appeal it might have.
> The syntax given above is too likely to run into problems as a
> simple '!'
> is too likely to occur in the expression or expansion, so possibly
> some more
> '@' based tokens could be used like @!expr@~...@|
>From my examination the following symbols don't appear as legal tokens
in Python expressions (they might always appear in string literals, of
course, but that's easy enough to avoid):
@ # $ : ; ?
Any of these can be used for delimiting expressions within a certain
construct. As for delimiting the start of the construct itself, any
character can be used following the prefix (by default, @), except for
those already used by the system.
As you point out, ! would be a bad choice since it appears legally in
Python code. (This discussion also made me just realize that @<... :
...> for try/catch like behavior with expressions was a mistake, since >
can appear perfectly legally in expressions ... no matter, I can
collapse it all into an uber-@( ... ) syntax.)
What would you suggest? @: ... : ... :? It's something I would expect
only advanced users to need, so it's probably not a problem if it
doesn't look too pretty.
--
Erik Max Francis / max at alcyone.com / http://www.alcyone.com/max/
__ San Jose, CA, US / 37 20 N 121 53 W / ICQ16063900 / &tSftDotIotE
/ \ There is nothing so subject to the inconstancy of fortune as war.
\__/ Miguel de Cervantes
Church / http://www.alcyone.com/pyos/church/
A lambda calculus explorer in Python.
More information about the Python-list
mailing list