On 30.08.16 21:20, Antoine Pitrou wrote:
On Tue, 30 Aug 2016 18:12:01 +0000
Brett Cannon <br...@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.
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