Coding⏱️ 2 min read📅 2026-05-30

How to Fix: Python 3.14 annotationlib throws NameError on local factory function defaults

Python 3.14 annotationlib throws NameError on local factory function defaults

Quick Answer: Use the `annotationlib` module's `get_annotations` function with the `default_factory` argument to avoid NameError when using default arguments generated by a factory function.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🚀 How to Resolve This Issue
  3. ✨ Wrapping Up

To resolve the NameError when using the annotationlib module in Python 3.14, you can use the `inspect` module to inspect annotations lazily without causing import circular dependencies.

⚠️ Common Causes

  • Importing the annotationlib module and using its functions without properly handling default arguments.

🚀 How to Resolve This Issue

Method 1: Using inspect module

  1. Step 1: Import the annotationlib and inspect modules.

Method 2: Using a factory function with no default argument

  1. Step 1: Define the factory function without a default argument.

✨ Wrapping Up

By following these steps, you can resolve the NameError when using the annotationlib module in Python 3.14 and build a dynamic validation tool.

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