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On 30.08.16 21:20, Antoine Pitrou wrote:
\> On Tue, 30 Aug 2016 18:12:01 +0000
\> Brett Cannon <brett@python.org> wrote:
\>>> Why not make it always a list? List objects are reasonably cheap in
\>>> memory and access time... (unlike dicts)
\>>
\>> Because I would prefer to avoid any form of unnecessary performance
\>> overhead for the common case.
\>
\> But the performance overhead of iterating over a 1-element list
\> is small enough (it's just an array access after a pointer dereference)
\> that it may not be larger than the overhead of the multiple tests and
\> conditional branches your example shows.

Iterating over a tuple is even faster. It needs one pointer dereference
less.

And for memory efficiency we can use just a raw array of pointers.