Fix side effects on params instance variables.

[junkmd]

Fix side effects on params instance variables.

Relevant issues

#9928

Pre-Submission checklist

Please complete all items before asking a LiteLLM maintainer to review your PR

• I have Added testing in the tests/litellm/ directory, Adding at least 1 test is a hard requirement - see details
• I have added a screenshot of my new test passing locally
• My PR passes all unit tests on (make test-unit)[https://docs.litellm.ai/docs/extras/contributing_code]
• My PR's scope is as isolated as possible, it only solves 1 specific problem

Type

🐛 Bug Fix
🧹 Refactoring
✅ Test

Changes

See files.

Results of added tests.

$ poetry run pytest tests/litellm/test_main.py::Test_Chat
=================================================================================================== test session starts ===================================================================================================
platform linux -- Python 3.11.11, pytest-7.4.4, pluggy-1.5.0
rootdir: /workspaces/litellm
plugins: respx-0.22.0, anyio-4.5.2, asyncio-0.21.2, mock-3.14.0
asyncio: mode=Mode.STRICT
collected 4 items                                                                                                                                                                                                         

tests/litellm/test_main.py ....                                                                                                                                                                                     [100%]

==================================================================================================== warnings summary =====================================================================================================
.venv/lib/python3.11/site-packages/pydantic/_internal/_config.py:295
  /workspaces/litellm/.venv/lib/python3.11/site-packages/pydantic/_internal/_config.py:295: PydanticDeprecatedSince20: Support for class-based `config` is deprecated, use ConfigDict instead. Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2 Migration Guide at https://errors.pydantic.dev/2.10/migration/
    warnings.warn(DEPRECATION_MESSAGE, DeprecationWarning)

litellm/utils.py:183
  /workspaces/litellm/litellm/utils.py:183: DeprecationWarning: open_text is deprecated. Use files() instead. Refer to https://importlib-resources.readthedocs.io/en/latest/using.html#migrating-from-legacy for migration advice.
    with resources.open_text(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
============================================================================================== 4 passed, 2 warnings in 0.76s ==============================================================================================

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 12, 2025 0:41am