From: Raymond Hettinger <rhettinger@users.noreply.github.com>
Date: Mon, 3 Jul 2023 20:38:38 +0000 (-0500)
Subject: Small speed-up for the convolve() recipe. (GH-106371)
X-Git-Tag: v3.13.0a1~1540
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=77090370952307730ea71d68b848cce0dc8cbd83;p=thirdparty%2FPython%2Fcpython.git

Small speed-up for the convolve() recipe. (GH-106371)
---

diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 56d6599798af..a2d1798a2c6d 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -1085,8 +1085,8 @@ The following recipes have a more mathematical flavor:
        kernel = tuple(kernel)[::-1]
        n = len(kernel)
        padded_signal = chain(repeat(0, n-1), signal, repeat(0, n-1))
-       for window in sliding_window(padded_signal, n):
-           yield math.sumprod(kernel, window)
+       windowed_signal = sliding_window(padded_signal, n)
+       return map(math.sumprod, repeat(kernel), windowed_signal)
 
    def polynomial_from_roots(roots):
        """Compute a polynomial's coefficients from its roots.