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[3.7] bpo-40419: timeit CLI docs now mention 1,2,5,10,... trials instead of powers of 10 (GH-19752) #19864

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Merged
miss-islington merged 1 commit into from
May 2, 2020
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[3.7] bpo-40419: timeit CLI docs now mention 1,2,5,10,... trials instead of powers of 10 (GH-19752) #19864

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3 changes: 2 additions & 1 deletion Doc/library/timeit.rst
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Expand Up @@ -251,7 +251,8 @@ quotes and using leading spaces. Multiple :option:`-s` options are treated
similarly.

If :option:`-n` is not given, a suitable number of loops is calculated by trying
successive powers of 10 until the total time is at least 0.2 seconds.
increasing numbers from the sequence 1, 2, 5, 10, 20, 50, ... until the total
time is at least 0.2 seconds.

:func:`default_timer` measurements can be affected by other programs running on
the same machine, so the best thing to do when accurate timing is necessary is
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3 changes: 2 additions & 1 deletion Lib/timeit.py
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Expand Up @@ -29,7 +29,8 @@
treated similarly.

If -n is not given, a suitable number of loops is calculated by trying
successive powers of 10 until the total time is at least 0.2 seconds.
increasing numbers from the sequence 1, 2, 5, 10, 20, 50, ... until the
total time is at least 0.2 seconds.

Note: there is a certain baseline overhead associated with executing a
pass statement. It differs between versions. The code here doesn't try
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