Description

cmaloney

opened on Feb 1, 2025

Issue body actions

Feature or enhancement

Proposal:

Add bytearray.resize() which wraps PyByteArray_Resize

PyByteArray_Resize is part of the C Stable API and allows efficiently expanding a bytearray object's buffer in place (when possible / most efficient) without needing to have another object which can "hold" the data temporarily or needing to copy the data from one storage to a second. (ex. bytearray.extend(itertools.range(0, 20), a = bytearray(); a += b'temp'.

This can be somewhat emulated currently with appending a itertools.range / iterator that provides __length_hint__, but that still requires copying byte data out of the iterator. PyByteArray_Resize doesn't require setting / clearing the newly allocated space, just always ensures the data ends with a null byte \0.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-129559: Add bytearray.resize() #129560
• gh-129559: Remove extra . in bytearray.resize AC #140134
• [3.14] gh-129559: Remove extra dot in bytearray.resize AC (GH-140134) #140143
• gh-129559: Add missing bytearray.resize free threading test #141739
• [3.14] gh-129559: add bytearray.resize thread safety test for free-threading (GH-141739) #141835

Reacted by Gregory P. Smith

Activity

1. cmaloney

   added

   type-featureA feature request or enhancementA feature request or enhancement

   on Feb 1, 2025
2. cmaloney

   added a commit that references this issue on Feb 1, 2025

   pythongh-129559: Add `bytearray.resize()`

   e240327
3. picnixz

   added

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   on Feb 2, 2025
4. vstinner

   changed the title [-]Expose PyByteArray_Resize on Python bytearray objects[/-] [+]Add bytearray.resize() method[/+] on Feb 2, 2025
5. brettcannon

   changed the title [-]Add bytearray.resize() method[/-] [+]Add `bytearray.resize()` method[/+] on Feb 3, 2025
6. gpshead

   added a commit that references this issue on Feb 5, 2025

   gh-129559: Add `bytearray.resize()` (GH-129560)

   5fb019f
7. gpshead commented on Feb 5, 2025

   

   gpshead

   on Feb 5, 2025

   Member

   More actions

   thanks!

   Reacted by Cody Maloney and Victor Stinner
8. gpshead

   closed this as completedon Feb 5, 2025
9. srinivasreddy

   added a commit that references this issue on Feb 7, 2025

   pythongh-129559: Add `bytearray.resize()` (pythonGH-129560)

   eeecb1c
10. cmaloney

    added a commit that references this issue on Feb 8, 2025

    pythongh-129559: Add `bytearray.resize()` (pythonGH-129560)

    0eebecf
11. cmaloney

    added a commit that references this issue on Oct 14, 2025

    pythongh-129559: Remove extra `.` in bytearray.resize AC

    c62f2c7
12. vstinner

    added a commit that references this issue on Oct 15, 2025

    gh-129559: Remove extra dot in bytearray.resize AC (#140134)

    6416e6e
13. miss-islington

    added a commit that references this issue on Oct 15, 2025

    pythongh-129559: Remove extra dot in bytearray.resize AC (pythonGH-14…

    18db34d
14. hugovk

    added a commit that references this issue on Oct 15, 2025

    [3.14] gh-129559: Remove extra dot in bytearray.resize AC (GH-140134) (…

    6b94c7c
15. cmaloney

    added a commit that references this issue on Nov 19, 2025

    pythongh-129559: Add missing bytearray.resize free threading test

    c92f24b
16. kumaraditya303

    added a commit that references this issue on Nov 21, 2025

    gh-129559: add `bytearray.resize` thread safety test for free-threadi…

    019c315
17. cmaloney

    added a commit that references this issue on Nov 22, 2025

    [3.14] pythongh-129559: add `bytearray.resize` thread safety test for…

    6e8d127
18. kumaraditya303

    added a commit that references this issue on Nov 22, 2025

    [3.14] gh-129559: add `bytearray.resize` thread safety test for free-…

    cfcf765
19. StanFromIreland

    added 2 commits that reference this issue on Dec 6, 2025

    pythongh-129559: Remove extra dot in bytearray.resize AC (python#140134)

    f6a91b9

    pythongh-129559: add `bytearray.resize` thread safety test for free-t…

    ed7b0f4
20. ashm-dev

    added a commit that references this issue on Dec 8, 2025

    pythongh-129559: add `bytearray.resize` thread safety test for free-t…

    3f21052

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