[Python-Dev] accumulator display syntax
Skip Montanaro
skip at pobox.com
Fri Oct 17 12:38:07 EDT 2003
>> I agree. Any expression bracketed by '[' and ']', no matter how many
>> other clues to the ultimate result it might contain, ought to result
>> in a list as far as I'm concerned.
Alex> Hmmm, how is, e.g.
Alex> foo[x*x for x in bar]
Alex> any more an "expression bracketed by [ and ]" than, say,
Alex> foo = {'wot': 'tow'}
Alex> foo['wot']
Alex> ...?
When I said "expression bracketed by '[' and ']' I agree I was thinking of
list construction sorts of things like:
foo = ['wot']
not indexing sorts of things like:
foo['wot']
I'm not in a mood to try and explain anything in more precise terms this
morning (for other reasons, it's been a piss poor day so far) and must trust
your ability to infer my meaning. I have no idea at this point how to
interpret
foo[x*x for x in bar]
That looks like a syntax error to me. You have a probably identifier
followed by a list comprehension.
Here's a slightly more precise term: If a '['...']' construct exists in
context where a list constructor would be legal today, it ought to evaluate
to a list, not to something else.
Alex> ... just as e.g. foo[ 'va':23:2j, {'zip':'zop'}:45:(3,4) ] ...
I have absolutely no idea how to interpret this. Is this existing or
proposed Python syntax?
Skip
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