From: Raymond Hettinger <python@rcn.com>
Date: Fri, 22 May 2009 01:11:26 +0000 (+0000)
Subject: Fix-up moving average example.
X-Git-Tag: v3.1rc1~91
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d40285a986990d45c29e83943dc7783a4e976da5;p=thirdparty%2FPython%2Fcpython.git

Fix-up moving average example.
---

diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index 3f5734884e6e..4c64d6144c1b 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -455,10 +455,9 @@ added elements by appending to the right and popping to the left::
         # moving_average([40, 30, 50, 46, 39, 44]) --> 40.0 42.0 45.0 43.0
         # http://en.wikipedia.org/wiki/Moving_average
         it = iter(iterable)
-        d = deque(itertools.islice(it, n))
+        d = deque(itertools.islice(it, n-1))
+        d.appendleft(0)
         s = sum(d)
-        if len(d) == n:
-            yield s / n
         for elem in it:
             s += elem - d.popleft()
             d.append(elem)