about_lists: pop(0) vs popleft() in 2vs3

irheart · irheart · commit f44242ec395c · 2014-07-09T00:12:58.000+04:00
I've looked for information on this note and haven't been able to find
anything of the sort.

A brief test in Py3.4.1 also indicates that list.pop(0) vs
deque.popleft() performance in Py3 is consistent with Py2.

&gt;&gt;&gt; import timeit
&gt;&gt;&gt; timeit.timeit('''x = list(range(100000))
while x:
x.pop(0)
''', number = 100)
385.9676046228002
&gt;&gt;&gt; timeit.timeit('''x = deque(range(1000000))
while x:
x.popleft()
''', setup = 'from collections import deque', number = 100)
17.6067819813139
diff --git a/python3/koans/about_lists.py b/python3/koans/about_lists.py
@@ -103,8 +103,6 @@ def test_making_queues(self):
         self.assertEqual(__, popped_value)
         self.assertEqual(__, queue)
 
-        # Note, for Python 2 popping from the left hand side of a list is
+        # Note, popping from the left hand side of a list is
         # inefficient. Use collections.deque instead.
 
-        # This is not an issue for Python 3 though
-
