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GeezerVison is showing github.com — gh-144001: Simplify Base64 decoding with altchars and ignorechars specified by serhiy-storchaka · Pull Request #144324 · python/cpython

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@serhiy-storchaka

@serhiy-storchaka serhiy-storchaka commented Jan 29, 2026 •
edited by github-actions Bot
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Treat "+" and "/" like other characters not in the alternative Base64 alphabet when both altchars and ignorechars are specified. E.g. discard them if they are not in altchars but are in ignorechars, and set error if they are not in altchars and not in ignorechars. Only emit warnings if ignorechars is not specified.

  • Issue: Add the ignorechars parameter in the Base64 decoder #144001

📚 Documentation preview 📚: https://cpython-previews--144324.org.readthedocs.build/

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@serhiy-storchaka
pythongh-144001: Simplify Base64 decoding with altchars and ignorecha…
ed8e5ff
…rs specified

Treat "+" and "/" like other characters not in the alternative Base64
alphabet when both altchars and ignorechars are specified.
E.g. discard them if they are not in altchars but are in ignorechars,
and set error if they are not in altchars and not in ignorechars.
Only emit warnings if ignorechars is not specified.
@serhiy-storchaka serhiy-storchaka added the skip news label Jan 29, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Jan 29, 2026
Add the ignorechars parameter in the Base64 decoder #144001
Closed
@bedevere-app bedevere-app Bot added the awaiting core review label Jan 29, 2026
@serhiy-storchaka
serhiy-storchaka merged commit c3b61ef into python:main Feb 2, 2026
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@bedevere-app bedevere-app Bot removed the awaiting core review label Feb 2, 2026
@serhiy-storchaka
serhiy-storchaka deleted the base64-decode-altchars-ignorechars branch February 2, 2026 11:38
Aniketsy pushed a commit to Aniketsy/cpython that referenced this pull request Feb 3, 2026
@serhiy-storchaka @Aniketsy
pythongh-144001: Simplify Base64 decoding with altchars and ignorecha…
2e5794e
…rs specified (pythonGH-144324)

Treat "+" and "/" like other characters not in the alternative Base64
alphabet when both altchars and ignorechars are specified.
E.g. discard them if they are not in altchars but are in ignorechars,
and set error if they are not in altchars and not in ignorechars.
Only emit warnings if ignorechars is not specified.
thunder-coding pushed a commit to thunder-coding/cpython that referenced this pull request Feb 15, 2026
@serhiy-storchaka @thunder-coding
pythongh-144001: Simplify Base64 decoding with altchars and ignorecha…
5113c50
…rs specified (pythonGH-144324)

Treat "+" and "/" like other characters not in the alternative Base64
alphabet when both altchars and ignorechars are specified.
E.g. discard them if they are not in altchars but are in ignorechars,
and set error if they are not in altchars and not in ignorechars.
Only emit warnings if ignorechars is not specified.
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@serhiy-storchaka
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