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gh-90533: Implement BytesIO.peek() by marcelm · Pull Request #150917 · python/cpython · GitHub

gh-90533: Implement BytesIO.peek() - #150917

Merged

vstinner merged 54 commits into

python:mainfrom

marcelm:fix-issue-46375

Jun 26, 2026

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
Merge branch 'main' into fix-issue-46375
marcelm
authored
7ef7f6d
Add to What’s New for 3.16
marcelm
committed
e038ae2
Update Doc/library/io.rst

marcelm
and
StanFromIreland
authored
3b71960
Run clinic
marcelm
committed
9c6e8ad

Commits on Jun 8, 2026

Merge branch 'main' into fix-issue-46375
emmatyping
authored
0be970e

Commits on Jun 11, 2026

Commits on Jun 18, 2026

Return at most DEFAULT_BUFFER_SIZE bytes if size is 0/-1/unspecified
marcelm
committed
5105c55
Apply suggestions from code review
vstinner
authored
11e65fe
Apply suggestions from code review
cmaloney
authored
514d102

Commits on Jun 24, 2026

Merge branch 'main' into fix-issue-46375
cmaloney
authored
bead21a

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