Puzzled by "is"

[Dick Moores]

>>() is ()
True

>>(1,) is (1,)

False

Why?

Thanks,

Dick Moores

[Neil Cerutti]

On 2007-08-09, Dick Moores <rd*@rcblue.comwrote:

>() is ()

True

>(1,) is (1,)

False

Why?

From _Python Reference Manual_: 5.2.4 List displays:

An empty pair of parentheses yields an empty tuple object.
Since tuples are immutable, the rules for literals apply (i.e.,
two occurrences of the empty tuple may or may not yield the
same object).

--
Neil Cerutti