15 Oct
2016
15 Oct
'16
1:36 p.m.
On Sun, Oct 16, 2016 at 4:33 AM, אלעזר
You are confusing here two distinct roles of the parenthesis: disambiguation as in "(1 + 2) * 2", and tuple construction as in (1, 2, 3). This overload is the reason that (1) is not a 1-tuple and we must write (1,).
Parentheses do not a tuple make. Commas do. 1, 2, 3, # three-element tuple 1, 2, # two-element tuple 1, # one-element tuple The only time that a tuple requires parens is when it's the empty tuple, (). ChrisA