On 10/23/10 10:20 PM, Robert Bradshaw wrote:
In most cases, it's really the comma (not the parentheses) that
creates the tuple.
sage: a = 123,
sage: a
(123,)
The parentheses are often needed for grouping purposes though.
Aha. That agrees with
http://docs.python.org/reference/expressions.html#parenthesized-forms
"Note that tuples are not formed by the parentheses, but rather by use
of the comma operator. The exception is the empty tuple, for which
parentheses are required — allowing unparenthesized “nothing” in
expressions would cause ambiguities and allow common typos to pass
uncaught."
Thanks,
Jason
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