python breaking changes

pypi

4 curated breaking changes across major versions of python. Use this as a migration checklist before bumping dependencies.

changes

Breaking changes by transition

3.12 \u2192 3.13removal
Many stdlib modules removed: cgi, cgitb, crypt, imghdr, mailcap, nis, nntplib, pipes, sndhdr, spwd, sunau, telnetlib, uu, xdrlib, audioop, chunk, msilib.
Migration
Replace with third-party alternatives. `cgi` -> `multipart`, `imghdr` -> `pillow`, etc.
3.12 \u2192 3.13runtime
Experimental JIT compiler and free-threaded build (no-GIL) available. Default build unchanged.
Migration
Not breaking. Opt in via `--enable-experimental-jit` or `--disable-gil` at compile time.
3.11 \u2192 3.12api
New type parameter syntax: `def foo[T](x: T) -> T` without TypeVar imports.
Migration
Optional. Old TypeVar syntax still works. New syntax requires 3.12+ in source files.
3.11 \u2192 3.12removal
distutils removed from stdlib (deprecated since 3.10).
Migration
Replace with `setuptools` or `packaging`. Many setup.py scripts need updating.

API access

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