"Chris Rebert" <c...@rebertia.com> wrote in message news:50697b2c0910042047i1cf2c1a3mc388bc74bab95...@mail.gmail.com...
Tuples are immutable (i.e. they cannot be modified after creation) and
are created using parentheses.

Slight correction: tuples are created using commas. Parentheses are only needed to disambiguate from other uses of comma:

Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
a=1,
a
(1,)
a=1,2,3
a
(1, 2, 3)

-Mark


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