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| -rw-r--r-- | Doc/library/collections.rst | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst index 5475776..3801cc8 100644 --- a/Doc/library/collections.rst +++ b/Doc/library/collections.rst @@ -476,16 +476,14 @@ added elements by appending to the right and popping to the left:: def moving_average(iterable, n=3): # moving_average([40, 30, 50, 46, 39, 44]) --> 40.0 42.0 45.0 43.0 # http://en.wikipedia.org/wiki/Moving_average - n = float(n) 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) - yield s / n + yield s / float(n) The :meth:`rotate` method provides a way to implement :class:`deque` slicing and deletion. For example, a pure python implementation of ``del d[n]`` relies on |