TypeError: Enum class does not support string inheritance without StrEnum in Python 3.11+

Python 3.11 introduced enum.StrEnum as the official standard class for string-based enumerations.

💡 Verified Solution

Import and inherit from enum.StrEnum instead of (str, Enum).

Patch / Unified Code Diff:

--- old.py
+++ new.py
@@ -1,3 +1,3 @@
-from enum import Enum
-class Color(str, Enum):
+from enum import StrEnum
+class Color(StrEnum):
     RED = 'red'

Official Primary Reference: https://docs.python.org/3/library/enum.html#enum.StrEnum

🧪 Sandbox Execution Evidence

Exit Code: 0

Tests Passed: 1 / 1

Confidence: 99%

Protocol: MCP 2026

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