INADA Naoki <songofaca...@gmail.com> added the comment:
I confirmed the cost is negligible.
python_startup_no_site
======================
Mean +- std dev: [master] 7.31 ms +- 0.39 ms -> [reverse] 7.41 ms +- 0.44 ms:
1.01x slower (+1%)
Mean +- std dev: [master] 7.31 ms +- 0.39 ms -> [register] 7.20 ms +- 0.28 ms:
1.01x faster (-1%)
Benchmark hidden because not significant (1): python_startup
"register" is "reverse" + following patch:
diff --git a/Lib/_collections_abc.py b/Lib/_collections_abc.py
index dbe30dff1f..28a7e2586c 100644
--- a/Lib/_collections_abc.py
+++ b/Lib/_collections_abc.py
@@ -280,6 +280,9 @@ Iterator.register(bytearray_iterator)
Iterator.register(dict_keyiterator)
Iterator.register(dict_valueiterator)
Iterator.register(dict_itemiterator)
+Iterator.register(type(iter(reversed({}.keys()))))
+Iterator.register(type(iter(reversed({}.values()))))
+Iterator.register(type(iter(reversed({}.items()))))
Iterator.register(list_iterator)
Iterator.register(list_reverseiterator)
Iterator.register(range_iterator)
@@ -306,6 +309,12 @@ class Reversible(Iterable):
return NotImplemented
+Reversible.register(dict)
+Reversible.register(type({}.keys()))
+Reversible.register(type({}.values()))
+Reversible.register(type({}.items()))
+
+
class Generator(Iterator):
__slots__ = ()
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33462>
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