On 08/03/17 11:07, Steven D'Aprano wrote:
I mentioned earlier that I have code which has to track the type of list
items, and swaps to a different algorithm when the types are not all the
same.
Hmmm. Yes, I guess if the expensive version requires a lot of
isinstance() messing or similar for each element then it could be better
to have optimized versions for homogeneous lists of ints or strings etc.
A list.is_heterogeneous() method
could be implemented if it was necessary,
I would prefer to get the list item's type:
if mylist.__type_hint__ is float:
If you know the list is homogeneous then the item's type is
"type(mylist[0])".
Also, having it be a function call gives an obvious place to put the
transition from "unknown" to known state if the tri-state hint approach
was taken. Otherwise, that would have to be hooked into the attribute
access somehow.
That's for someone who wants to try implementing it to decide and
propose though :)
E.
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