For review: PEP 308 - If-then-else expression
Erik Max Francis
max at alcyone.com
Mon Feb 10 23:01:24 EST 2003
Michele Simionato wrote:
> I don't want to overload "if" since the typical situations where I
> would
> like to use the ternary operator, are in nested "if" expressions or in
> listcomp with "if". Having a new keyword like "when" would help
> clarity.
> Moreover I fear abuses like
>
> files=[f for f in os.listdir(mydir) \
> if (if issource: f.endswith('.py') else: True)]
That's just the use of a conditional operator as the conditional in an
if statement. That's bad style in any language; Python is not an
exception.
Will there be abuses? I'm sure there will, but that's true for every
language syntax; _any_ syntax can be abused, even in a language as
straightforward and simple as Python. Will it give more expressivity to
those who want the syntax and know and when how to use it properly? The
point is: Yes.
People are already using broken, unreadable mimics _incorrectly_.
--
Erik Max Francis / max at alcyone.com / http://www.alcyone.com/max/
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