Tuples

A tuple is like a list, except that it is immutable - its contents can't be changed once created.
Tuples are defined in parentheses, rather than square brackets, or just as a series of comma-separated values with nothing around them.

>>> x = (1, 2, 3)

A major use for tuples is for multiple return values from a function.

>>> def doubledouble(x,y):
...     return x*2, y*2
...
>>> a,b = doubledouble(3,5)
>>> print a
6
>>> print b
10