What is a function parameter =[] for?

[Chris Angelico]

On Thu, Nov 26, 2015 at 1:08 PM, Alan Bawden <alan at csail.mit.edu> wrote:
> (Note that nothing in the documentation I can find actually _guarantees_
> that a Python implementation will only have one unique empty tuple, but
> I wouldn't be suprised if the following is nonetheless true in all
> current implementations:
>
>    >>> tuple([]) is tuple([])
>    True
>
> )

Jython 2.5.3 (, Oct 8 2014, 03:39:09)
[OpenJDK 64-Bit Server VM (Oracle Corporation)] on java1.7.0_85
Type "help", "copyright", "credits" or "license" for more information.
>>> tuple([]) is tuple([])
False

Python 2.7.8 (2.4.0+dfsg-3, Dec 20 2014, 13:30:46)
[PyPy 2.4.0 with GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>> tuple([]) is tuple([])
False

ChrisA