Fix LocalPythonExecutor support for Enum and other metaclasses by colesmcintosh · Pull Request #1797 · huggingface/smolagents (original) (raw)

Fixes huggingface#1795

The LocalPythonExecutor was using the generic type() function to create all classes, which fails for classes with custom metaclasses like Enum. Python's Enum metaclass requires a special _EnumDict namespace object during class creation, not a regular dict.

This fix:

• Detects when a base class has a custom metaclass
• Uses the metaclass's __prepare__() method if available to create the proper namespace dictionary
• Uses the detected metaclass instead of type() when instantiating the class

This enables support for Enum and any other class that uses a custom metaclass with a __prepare__() method.

approved these changes Oct 9, 2025

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