Python: Cleanup Sprint Hits Old Bugs and Security Gaps

A wave of merges this cycle fixed longstanding correctness bugs in struct, robots.txt parsing, and asyncio, while a separate cluster addressed HTML-injection risk in profiling tools. Serhiy Storchaka and the backport bot were the day's most active contributors, pushing several fixes across the 3.13, 3.14, and 3.15 branches simultaneously.

Duration: PT2M28S

Episode overview

This episode is a short developer briefing from Python.

It explains recent repository work in plain language.

  • Show: Python
  • Published: 2026-07-17T13:07:16Z
  • Audio duration: PT2M28S

Transcript excerpt

This excerpt keeps the crawler page concise. Listen to the episode or use the RSS feed for the full update.

Good day, and welcome to Python for July 17th, 2026.

The big pattern today is old, subtle bugs getting cleaned up and immediately backported across three release branches at once. This is maintenance week in disguise.

Start with struct. Serhiy Storchaka's fix in PR 153627 resolves a BytesWarning bug that's been lurking since format caching was added — mixing string and bytes format specifiers under strict bytes-warning mode triggered a false comparison warning. It's now normalized and backported to 3.13, 3.14, and 3.15 within…

Same pattern with robots.txt parsing. Tonghuaroot's fix in PR 153405 stops a crash when Crawl-delay or Request-rate fields contain non-decimal Unicode digits — previously, one malformed directive could abort parsing the entire file. Again, backported across all three active branches immediately.

And asyncio's sock_accept saw a fix for dropped connections on cancellation, also propagated to 3.13 through 3.15. Three separate bugs, three separate authors, same release discipline: fix once, backport everywhere, same day.

Second theme: security hardening in the profiling and tracing tools. Tonghuaroot filed two related fixes — one capping file reads in the heatmap…

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