Agent-Skills.md

Agent Skills: Python 3.13+ Knowledge Patch

Python changes since training cutoff (latest: 3.14) — t-strings, deferred annotations, free-threaded CPython, subinterpreters, zstd compression, dead battery removals. Load before working with Python.

UncategorizedID: nevaberry/nevaberry-plugins/python-knowledge-patch

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Skill Metadata

Name
python-knowledge-patch
Description
"Python changes since training cutoff (latest: 3.14) — t-strings, deferred annotations, free-threaded CPython, subinterpreters, zstd compression, dead battery removals. Load before working with Python."

Python 3.13+ Knowledge Patch

Claude's baseline knowledge covers Python through 3.12. This skill provides features from 3.13 (Oct 2024) onwards.

Source: Python "What's New" documentation at https://docs.python.org/3/whatsnew/

3.13 Breaking Changes

| Change | Impact | |--------|--------| | 19 "dead battery" modules removed (PEP 594) | ImportError for cgi, crypt, imghdr, telnetlib, etc. See removals | | locals() returns snapshots in functions (PEP 667) | exec()/eval() in functions need explicit namespace. See new-modules | | TypedDict("T", x=int) keyword syntax removed | Use class syntax or TypedDict("T", {"x": int}) | | pathlib.Path.glob("**") returns files AND dirs | Add trailing / for dirs only: glob("**/") | | Docstring leading whitespace stripped | May affect doctest tests |

3.13 New Features

| Feature | Quick reference | |---------|----------------| | Free-threaded CPython (PEP 703) | python3.13t, sys._is_gil_enabled(), PYTHON_GIL=0. See concurrency | | copy.replace() protocol | copy.replace(obj, field=val), implement __replace__(). See new-modules | | warnings.deprecated() (PEP 702) | @deprecated("msg") — runtime warning + type checker signal. See new-modules |

3.14 New Syntax

| Feature | Quick reference | |---------|----------------| | T-strings (PEP 750) | t"Hello {name}" → Template object. from string.templatelib import Template, Interpolation. See new-syntax | | Deferred annotations (PEP 649/749) | Forward refs no longer need quotes. from annotationlib import get_annotations, Format. See new-syntax | | except without brackets (PEP 758) | except A, B: (no parens, no as). Parens still needed with as. |

3.14 New Modules

| Module | Quick reference | |--------|----------------| | compression.zstd (PEP 784) | from compression import zstd; zstd.compress(data). See new-modules | | concurrent.interpreters (PEP 734) | Subinterpreters + InterpreterPoolExecutor. See concurrency | | annotationlib | get_annotations(obj, format=Format.FORWARDREF) | | functools.Placeholder | partial(func, Placeholder, fixed_arg) — reserve positional slots |

3.14 Breaking Changes

| Change | Impact | |--------|--------| | asyncio.get_event_loop() raises RuntimeError | Must use asyncio.run() or asyncio.Runner | | multiprocessing default → 'forkserver' on Linux | May cause pickling errors; use get_context('fork') | | int() no longer uses __trunc__() | Must implement __int__() or __index__() | | functools.partial is method descriptor | Wrap in staticmethod() for classes | | from __future__ import annotations deprecated | Unchanged behavior; removal after 2029 | | ast.Num/Str/Bytes removed | Use ast.Constant | | asyncio child watcher classes removed | Use asyncio.run() | | SyntaxWarning in finally (PEP 765) | return/break/continue in finally now warns |

3.14 New APIs

| API | Quick reference | |-----|----------------| | sys.remote_exec(pid, script) (PEP 768) | Attach debugger to running process; python -m pdb -p PID. See new-modules | | io.Reader / io.Writer | Simpler protocol alternatives to typing.IO | | uuid.uuid7() | Time-ordered UUID (RFC 9562); also uuid6(), uuid8() | | heapq.*_max() | heapify_max(), heappush_max(), heappop_max(), etc. | | Free-threading (PEP 779) | Now officially supported; 5-10% overhead |

Reference Files

For detailed patterns, code examples, and migration guidance, consult:

  • references/new-syntax.md — T-strings (template processors, API), deferred annotations (annotationlib), except without brackets
  • references/new-modules.md — compression.zstd, functools.Placeholder, copy.replace(), warnings.deprecated(), locals() semantics, remote debugging, io.Reader/Writer, uuid.uuid7(), heapq max-heap
  • references/concurrency.md — Free-threaded CPython (GIL-free mode), subinterpreters, InterpreterPoolExecutor
  • references/removals.md — Dead batteries (19 modules), 3.13/3.14 removals, breaking behavior changes