Howdy!
> Thanks for your comments.
I've always wanted to play the devil's advocate. :^)
> Perhaps, it's once of the cases that practicality beats purity.
> IMO, expecting our users to do tricks like (["Yes", "No"]
> [some_boolean]), or (bool and 'yes' or 'no') will turn off many
> newbies.
No more difficult than having new users understand how a decorator
works... or a list comprehension. AFIK 'bool and trueval or
falseval' is a standard Python idiom, much like the C/C++/PHP/etc.
'bool ? trueval : falseval' statement. It, at its core, functions
the same, but also has fall-through capability (e.g. if trueval
resolves to false, say, an empty string, it will cascade to the
falseval. I think.)
As for the list index boolean - I used it for along time, before
discovering the many problems it has, specifically in the case of
using values that might not exist.
The pipe or double-pipe syntax for calling functions would be unique
to the templating engine, and users might wonder why Python doesn't
include such a feature, esp. as KID is marketed as a very Python-like
XML processor and describes ${} as "Python Expression
Substitution"... not "funky template language substitution". ;-)
> It might be a good solution indeed to pass a common set of
> "formatting functions" through the tg namespace. Its mostly a trade-
> off of purity and convenience.
Indeed, I would be much happier with this solution, and I already do
pass several formatting functions of my own. However, I'd like to
see a feature like these double-pipe filters getting past Guido to be
implemented in Python itself. XD
Have a great day,
Matthew Bevan, Systems Administrator
Top Floor Computer Systems Ltd.
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