fix(cli): drop enum.StrEnum so the CLI imports on Python 3.10

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

litellm/proxy/client/cli/commands/pi.py

@@ -10,7 +10,7 @@ import os
 import tempfile
 from collections.abc import Callable, Mapping
 from dataclasses import dataclass
-from enum import StrEnum
+from enum import Enum
 from pathlib import Path
 from types import MappingProxyType
 from typing import Annotated, Final
@@ -25,7 +25,7 @@ LITELLM_PROXY_API_KEY_ENV: Final = "LITELLM_PROXY_API_KEY"
 _REJECTED_STATUSES: Final = frozenset((401, 403))
 
 
-class ListingFailure(StrEnum):
+class ListingFailure(str, Enum):
     """Why a proxy could not be listed, decided once where the HTTP outcome is classified.
 
     `unreachable` means no response at all; the other kinds prove the proxy answered, so callers

tests/test_litellm/proxy/client/cli/test_pi.py

@@ -1,3 +1,4 @@
+import inspect
 import json
 import os
 import stat
@@ -7,6 +8,7 @@ from pathlib import Path
 import pytest
 import requests
 
+from litellm.proxy.client.cli.commands import pi
 from litellm.proxy.client.cli.commands.pi import (
     ListingFailure,
     ModelLimits,
@@ -20,6 +22,18 @@ from litellm.proxy.client.cli.commands.pi import (
 )
 
 
+def test_pi_module_has_no_strenum_import():
+    """enum.StrEnum is Python 3.11+; pyproject allows 3.10, so pi.py must not import it."""
+    assert "StrEnum" not in inspect.getsource(pi)
+
+
+def test_listing_failure_is_str_enum():
+    assert issubclass(ListingFailure, str)
+    assert ListingFailure.REJECTED.value == "rejected"
+    assert ListingFailure("rejected") is ListingFailure.REJECTED
+    assert str(ListingFailure.REJECTED.value) == "rejected"
+
+
 class _FakeResponse:
     def __init__(self, status_code, payload=None):
         self.status_code = status_code