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Fix typing_extensions import to avoid ModuleNotFoundError on Python 3.11+ #71

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@mikaeloduh mikaeloduh commented Jul 7, 2025

This PR addresses an import issue with typing_extensions in the SDK.

Problem:

  • The current code unconditionally imports typing_extensions.NotRequired
  • However, in pyproject.toml, typing_extensions is only installed for Python < 3.11
  • On Python 3.11+, typing.NotRequired exists, but the package may not be installed
  • This causes ModuleNotFoundError on a clean install with Python 3.11+

Solution:

  • Use version-conditional imports to fallback to typing on Python 3.11+
  • Ensures compatibility without forcing unnecessary dependencies

The SDK unconditionally imported `typing_extensions.NotRequired`, but `typing_extensions` is declared as a dependency only for Python < 3.11 in pyproject.toml. On Python 3.11+ this led to a ModuleNotFoundError on a clean install.

This commit replaces the unconditional import with a version-guarded
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@dicksontsai dicksontsai left a comment

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This PR isn't strictly necessary because anyio will pull in typing_extensions, but it's fine to merge after addressing imports.

@@ -1,5 +1,8 @@
"""Tests for Claude SDK type definitions."""

import sys
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You don't need to import sys and pytest

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