Vyacheslav Maslov wrote:
> So, the main question is why using syntax like [X] python constuct list
> with
> one item, but when i try to construct tuple with one item using similar
> syntax (X) python do nothing?
Because `(` and `)` are used in expressions to bracket sub-expressions.
a = (4 + 3) * 2
means: add 4 to 3, multiply the sum by 2. It can't mean: make a tuple
containing 7 and extend it to 7,7 .
The real constructor for tuples is `,`. When you see parens around
tuple creation they're there to bracket the sub-expression that
creates the tuple. You see new tuples without parens all the time:
for i, thing in enumerate (things): ...
starter, main_course, dessert, beverage = order_meal (*hunger)
etc.
Mel.
--
http://mail.python.org/mailman/listinfo/python-list
