<[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > The question is, is this, > conceptually, the feature that allows you to ommit the parentheses of a > tuple in some cases.
To repeat: tuples are defined by commas. There are no 'parentheses of a tuple', except for empty tuples, to be omitted. Consider: a+b is a sum; in (a+b)*c, the sum is parenthesized to avoid confusion with a+b*c. Like other expressions, tuples are parenthesezed when needed to avoid similar confusion. So (1,2)+(3,4) needs parens because 1,2+3,4 would be something different. In both examples, parens are used to reverse normal precedence relations. Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
