From fcf58a151824d9af5962248fc176dc5749138eac Mon Sep 17 00:00:00 2001 From: Martin Panter Date: Sat, 3 Oct 2015 07:37:22 +0000 Subject: [PATCH] Issue #16701: Document += and *= for mutable sequences --- Doc/library/stdtypes.rst | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst index 86aae512c4..94bfac1ead 100644 --- a/Doc/library/stdtypes.rst +++ b/Doc/library/stdtypes.rst @@ -1613,8 +1613,11 @@ an arbitrary object): | ``s.append(x)`` | same as ``s[len(s):len(s)] = | \(2) | | | [x]`` | | +------------------------------+--------------------------------+---------------------+ -| ``s.extend(x)`` | same as ``s[len(s):len(s)] = | \(3) | -| | x`` | | +| ``s.extend(x)`` or | for the most part the same as | \(3) | +| ``s += t`` | ``s[len(s):len(s)] = x`` | | ++------------------------------+--------------------------------+---------------------+ +| ``s *= n`` | updates *s* with its contents | \(11) | +| | repeated *n* times | | +------------------------------+--------------------------------+---------------------+ | ``s.count(x)`` | return number of *i*'s for | | | | which ``s[i] == x`` | | @@ -1720,6 +1723,12 @@ Notes: :exc:`ValueError` if it can detect that the list has been mutated during a sort. +(11) + The value *n* is an integer, or an object implementing + :meth:`~object.__index__`. Zero and negative values of *n* clear + the sequence. Items in the sequence are not copied; they are referenced + multiple times, as explained for ``s * n`` under :ref:`typesseq`. + .. _types-set: -- 2.50.1