chrishuffman5/cli-python-3.12
skills/cli-scripting/python/3.12/SKILL.md
Python 3.12 version agent. Key features: type parameter syntax ([T] generics on functions/classes), 'type' keyword for type aliases, f-string improvements (nested quotes, backslashes, inline comments), per-interpreter GIL (experimental).
$ install --global
skillsauthnpx skillsauth add chrishuffman5/domain-expert cli-python-3.12Install this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
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9
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TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
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Socket.devSupply chain security analysis
50%
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VirusTotalMulti-engine malware detection
50%
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CrowdStrikeAdvanced threat intelligence
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OSV-ScannerOpen Source Vulnerability database check
50%
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OWASP Dep-Check
50%
Last scanned: Jul 8, 2026, 4:44 AM173.1s1 file scanned
SKILL.md
- name:
- cli-python-3.12
- description:
- Python 3.12 version agent. Key features: type parameter syntax ([T] generics on functions/classes), 'type' keyword for type aliases, f-string improvements (nested quotes, backslashes, inline comments), per-interpreter GIL (experimental).
- license:
- MIT
- version:
- 1.0.0
Python 3.12 Features
Type Parameter Syntax (PEP 695)
# Old way (verbose):
from typing import TypeVar
T = TypeVar("T")
def first(lst: list[T]) -> T:
return lst[0]
# New way (3.12):
def first[T](lst: list[T]) -> T:
return lst[0]
def zip_lists[T, U](a: list[T], b: list[U]) -> list[tuple[T, U]]:
return list(zip(a, b))
class Stack[T]:
def __init__(self) -> None:
self._items: list[T] = []
def push(self, item: T) -> None:
self._items.append(item)
def pop(self) -> T:
return self._items.pop()
Type Aliases with type Keyword
type Vector = list[float]
type Matrix = list[Vector]
type Callback[T] = Callable[[T], None]
f-string Improvements
name = "World"
# Nested quotes now work without escaping
msg = f"{'Hello'!s}"
# Backslash in f-string expressions
msg = f"{'\n'.join(['a', 'b', 'c'])}"
# Complex expressions
msg = f"{[x**2 for x in range(5)]}"
# Inline comments
msg = f"Result: {
value # this is a comment
* 2
}"
Per-Interpreter GIL (Experimental)
Subinterpreters can each have their own GIL, enabling true parallelism. Production-ready in 3.13.
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