Python: The IMAP Library Gets a Deep Cleanup
Serhiy Storchaka led a coordinated overhaul of the imaplib module, tightening security checks, correcting RFC references, and adding three new methods, while the parser and regex engine each got precision fixes.
Duration: PT2M39S
Episode overview
This episode is a short developer briefing from Python.
It explains recent repository work in plain language.
- Show: Python
- Published: 2026-07-06T13:05:14Z
- Audio duration: PT2M39S
Transcript excerpt
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Good morning. It's July 6th, 2026, and this is Python.
The clearest story in today's activity is a concentrated push to modernize imaplib, Python's IMAP client library. Nearly a third of today's merges touch it, all from Serhiy Storchaka, and they build on each other in a logical sequence.
It starts with correctness: PR 153126 fixes RFC references in the library's documentation and code, pointing to RFC 3501 instead of the outdated RFC 2060, and correcting a note about where the "]" character is actually disallowed. That fix immediately got backported to three older Python versions.
From there, security and compatibility improvements followed. PR 153067 narrows an overly broad control-character check in imaplib commands. The old code rejected an entire range of control characters, which sounds safe but actually broke real-world use, since some servers legitimately return mailbox names…
Two smaller but notable fixes round out the picture. PR 153175 sharpens the parser's syntax error messages, so expressions like "1 times plus not x" now get a specific, helpful error instead of a generic "invalid syntax." And PR 153160 replaces a fragile state check in the regex engine with an…
Also…
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