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gh-90533: Implement BytesIO.peek() - #30808

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marcelm wants to merge 41 commits into

python:mainfrom

marcelm:fix-issue-46375

Commits on Apr 10, 2026
- Implement BytesIO.peek()
  marcelm
  committed
  b833b83
- 📜🤖 Added by blurb_it.
  
  blurb-it[bot]
  authored and
  marcelm
  committed
  50a2cfb
- Document BytesIO.peek()
  marcelm
  committed
  eaa7672
- Implement with the help of read_bytes()
  marcelm
  committed
  00457ae
- Add to What’s New
  marcelm
  committed
  882579d
- versionadded: 3.12 -> 3.13
  marcelm
  committed
  c1eed72
- Remove unused variable
  marcelm
  committed
  afc200c
- Test tell() after peek()
  marcelm
  committed
  79ab9a4
- Update docs, factor out peek_bytes, semantics
  marcelm
  committed
  b493914
- Update Misc/NEWS.d/next/Library/2022-04-10-20-10-59.bpo-46375.8j1ogZ.rst
  
  marcelm
  and
  erlend-aasland
  committed
  2a1c85c
- Update Modules/_io/bytesio.c
  
  marcelm
  and
  erlend-aasland
  committed
  d398717
- Update Modules/_io/bytesio.c
  
  marcelm
  and
  erlend-aasland
  committed
  26d1e81
- Use SemBr
  
  marcelm
  and
  erlend-aasland
  committed
  9a19ff9
- Update Doc/whatsnew/3.13.rst
  
  marcelm
  and
  erlend-aasland
  committed
  9300ade
- Apply suggestions from code review
  
  marcelm
  and
  vstinner
  committed
  d214089
- Use a context manager around memio in test_peek
  marcelm
  committed
  d6691b8
- Add more tests for tell() after peek()
  marcelm
  committed
  3e51adb
- Document why size < 0 can happen
  marcelm
  committed
  3661b65
- Update Modules/_io/bytesio.c
  
  marcelm
  and
  erlend-aasland
  committed
  cd40d77
- Do not update pos if peek_bytes failed
  marcelm
  committed
  04372bd
- Size can be negative after truncate or seek
  marcelm
  committed
  6b9ae8c
- Test with size<0 and size>len(buf)
  marcelm
  committed
  f7406f6
- Test peek() after write()
  marcelm
  committed
  d9528e2
- Document BufferedReader.peek and BytesIO.peek similarly
  marcelm
  committed
  bc8134b
- Comment
  marcelm
  committed
  b6ffca8
- Make it more explicit that size is ignored
  marcelm
  committed
  5fe5645
- Return an empty bytes object for size=0
  marcelm
  committed
  4126a64
- Simplify
  marcelm
  committed
  1ea40c2
- Test peek(3) and peek(5)
  marcelm
  committed
  77e04d6
- Run clinic.py
  marcelm
  committed
  4d2f2dd
Commits on Apr 13, 2026
- Apply suggestions from code review
  
  marcelm
  and
  vstinner
  authored
  c16bebf
- Do not return an empty bytes object for size=0
  marcelm
  committed
  08bd7da
Commits on Apr 15, 2026
- Decorate BytesIO.peek with `@critical_section`
  marcelm
  committed
  6174fca
Commits on Apr 21, 2026
- Test peek returns EOF after seeking to EOF
  marcelm
  committed
  b8b8cf4
- Free-threading test for peek
  marcelm
  committed
  7ac914e
Commits on Apr 27, 2026
- Fix free-threading test
  marcelm
  committed
  abbd8f0
Commits on Apr 29, 2026
- Default to size=0; cap to DEFAULT_BUFFER_SIZE
  marcelm
  committed
  07d9e4d
Commits on Apr 30, 2026
- Revert changes to BufferedReader.peek documentation
  marcelm
  committed
  3d57f45
Commits on May 1, 2026
- Test peek after seek or truncate
  marcelm
  committed
  023ad25
- Merge branch 'main' into fix-issue-46375
  emmatyping
  authored
  203749b
Commits on Jun 4, 2026
- Do not cap at DEFAULT_BUFFER_SIZE
  marcelm
  committed
  32fd791

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Commits on Apr 10, 2026

Commits on Apr 13, 2026

Commits on Apr 15, 2026

Commits on Apr 21, 2026

Commits on Apr 27, 2026

Commits on Apr 29, 2026

Commits on Apr 30, 2026

Commits on May 1, 2026

Commits on Jun 4, 2026