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docs: add s += t/s *= n Operation #142611

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zhangenming Dec 12, 2025
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Merge branch 'python:main' into patch-3
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4 changes: 2 additions & 2 deletions Doc/library/stdtypes.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1010,11 +1010,11 @@ operations have the same priority as the corresponding numeric operations. [3]_
| ``x not in s`` | ``False`` if an item of *s* is | \(1) |
| | equal to *x*, else ``True`` | |
+--------------------------+--------------------------------+----------+
| ``s + t`` | the concatenation of *s* and | (6)(7) |
| ``s + t`` or ``s += t`` | the concatenation of *s* and | (6)(7) |
| | *t* | |
+--------------------------+--------------------------------+----------+
| ``s * n`` or | equivalent to adding *s* to | (2)(7) |
| ``n * s`` | itself *n* times | |
| ``n * s`` or ``s *= n`` | itself *n* times | |
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@skirpichev skirpichev Dec 12, 2025

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I don't think the second form is an equivalent of n * s. Ditto for concatenation.

Rather you could extend the footnote to mention that some sequence types have support for in-place concatenation (or repetition).

CC @StanFromIreland

+--------------------------+--------------------------------+----------+
| ``s[i]`` | *i*\ th item of *s*, origin 0 | (3)(8) |
+--------------------------+--------------------------------+----------+
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