Terry Reedy wrote:
> "Nick Coghlan" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> | More completely:
> |
> | () # empty tuple
> | (1,) # 1 item tuple
> | (1,2) # 2 item tuple
>
> 1, # 1 item tuple, no parens needed, trailing comma mandatory
> 1,2 # 2 item tuple, no parens needed
> 1,2, # 2 item tuple with optional trailing comma
No parens needed, unless the comma would be interpreted as meaning
something else if the parens were left out (function argument separator,
name separator in a 2.x series except clause, item separator in a
surrounding tuple/list/dict definition, etc), or if the first expression
would be overinclusive without them (e.g. string formatting with %). A
lot of the time I find it easier to just include the parentheses instead
of worrying about it (they're kind of like yield expressions that way...).
Anyway, for the kind of stylistic comparison I was talking about in the
previous post, I think it is useful to think of the parentheses as part
of the tuple syntax (because that's the way they are often written),
even though that isn't completely correct in terms of the language's
grammar.
We've veered pretty far from the original topic now though, so it would
probably be best to drop the mailing list from any further discussion :)
Cheers,
Nick.
--
Nick Coghlan | [EMAIL PROTECTED] | Brisbane, Australia
---------------------------------------------------------------
http://www.boredomandlaziness.org
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