chrishuffman5/cli-python-3.14
skills/cli-scripting/python/3.14/SKILL.md
Python 3.14 version agent. Key features: template strings (t'...' returning Template objects for safe interpolation), deferred annotation evaluation (PEP 749, annotations stored as strings and evaluated lazily).
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Last scanned: Jul 8, 2026, 4:46 AM305.4s1 file scanned
SKILL.md
- name:
- cli-python-3.14
- description:
- Python 3.14 version agent. Key features: template strings (t'...' returning Template objects for safe interpolation), deferred annotation evaluation (PEP 749, annotations stored as strings and evaluated lazily).
- license:
- MIT
- version:
- 1.0.0
Python 3.14 Features
Template Strings (PEP 750)
Unlike f-strings which produce str, t-strings produce a Template object. This allows frameworks to process interpolated parts safely (SQL injection prevention, HTML escaping, structured logging).
# t-strings return Template, not str
greeting = t"Hello, {name}!"
# greeting.strings = ("Hello, ", "!")
# greeting.interpolations = [Interpolation(name, "name", None, "")]
# Safe HTML rendering
def safe_html(template) -> str:
import html
parts = []
for item in template:
if isinstance(item, str):
parts.append(item)
else:
parts.append(html.escape(str(item.value)))
return "".join(parts)
user_input = "<script>alert('xss')</script>"
output = safe_html(t"<p>Hello, {user_input}!</p>")
# "<p>Hello, <script>alert('xss')</script>!</p>"
# SQL safety pattern
def sql_query(template) -> tuple[str, list]:
query_parts, params = [], []
for item in template:
if isinstance(item, str):
query_parts.append(item)
else:
query_parts.append("?")
params.append(item.value)
return "".join(query_parts), params
name = "Alice"
query, params = sql_query(t"SELECT * FROM users WHERE name = {name}")
# query = "SELECT * FROM users WHERE name = ?"
# params = ["Alice"]
Deferred Annotation Evaluation (PEP 749)
Annotations are stored as strings by default in 3.14 and evaluated lazily only when inspect.get_annotations() is called. This replaces the from __future__ import annotations approach.
class Config:
host: str # stored as string "str", not evaluated at class creation
port: int
tags: list[str]
import inspect
hints = inspect.get_annotations(Config, eval_str=True)
# {"host": str, "port": int, "tags": list[str]}
Benefits:
- Forward references work without quotes or
__future__import - Faster class creation (no annotation evaluation)
- Reduced import-time overhead
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