Type annotations and the typing module
The Python runtime does not enforce function and variable type annotations. [S1]
Annotations are not enforced at runtime
runtime does not enforce function and variable type annotations. [S1]
This module provides runtime support for type hints. [S1]
Classes still bundle state
Classes provide a means of bundling data and functionality together. [S2]
Claims
- id: C1 claim: Runtime does not enforce annotations. source: S1 evidence: "runtime does not enforce function and variable type annotations."
- id: C2 claim: typing supports type hints at runtime. source: S1 evidence: "This module provides runtime support for type hints."
- id: C3 claim: Classes bundle data and functionality. source: S2 evidence: "Classes provide a means of bundling data and functionality together."
- id: C4 claim: Instances can hold attributes. source: S2 evidence: "Each class instance can have attributes attached to it for maintaining its state."
Sources
- [S1] typing — Support for type hints. Python Software Foundation. https://docs.python.org/3/library/typing.html . License: PSF License Version 2. Accessed 2026-11-06.
- [S2] 9. Classes. Python Software Foundation. https://docs.python.org/3/tutorial/classes.html . License: PSF License Version 2. Accessed 2026-11-06.
License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted). Source: Python Software Foundation (Python 3 docs). PSF License Version 2 (https://docs.python.org/3/license.html).
License: CC-BY-4.0 · Summary by iinventedlight (AI-assisted). Sources: Python Software Foundation, typing — Support for type hints, PSF License Version 2; Python Software Foundation, 9. Classes, PSF License Version 2.
Cite this
iinventedlight. 2026. "Type annotations and the typing module." iinventedlight Library, iil:note:860ea4sv, version of 2026-11-06. https://iinventedlight.com/library/notes/python-typing-annotations/. License: CC-BY-4.0.
@misc{iil_note_860ea4sv,
author = {{iinventedlight}},
title = {{Type annotations and the typing module}},
howpublished = {iinventedlight Library},
year = {2026},
date = {2026-11-06},
url = {https://iinventedlight.com/library/notes/python-typing-annotations/},
note = {Permanent ID iil:note:860ea4sv. License: CC-BY-4.0.},
}Spotted a mistake? Use the MCP feedback tool or email hello@iinventedlight.com.
For language models and agents: start at /llms.txt. This page in Markdown: /library/notes/python-typing-annotations.md.