Why tuples use parentheses ()'s instead of something else like <>'s?
Hans Nowak
hans at zephyrfalcon.org
Wed Dec 29 07:25:03 CET 2004
seberino at spawar.navy.mil wrote:
> Tuples are defined with regards to parentheses ()'s as everyone knows.
>
> This causes confusion for 1 item tuples since (5) can be interpreted
> as a tuple OR as the number 5 in a mathematical expression
> such as x = (5) * (4+6).
No, (5) is always the number 5. To make a one-element tuple, use (5,).
> Wouldn't it have been better to define tuples with <>'s or {}'s or
> something else to avoid this confusion??
>
> Perhaps ()'s are a good idea for some other reason I don't know?
Actually, for non-empty tuples, the parentheses aren't really necessary,
unless code is ambiguous.
>>> x = 1, 2, 3
>>> x
(1, 2, 3)
>>> y = 5,
>>> y
(5,)
but:
>>> print 8, 9 # not a tuple
8 9
>>> print (8, 9)
(8, 9)
HTH,
--
Hans Nowak
http://zephyrfalcon.org/
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