[PY] fix: Don't use json/yaml formatting for simple string values

[jbaron]

Linked issues

closes: #2209

Details

Changed the Python to_string function to not convert the value object if it is just a plain string. This caused the introduction of doubled quotes and made responses render badly in MS Teams.

Change details

Just added a single check to the to_string function that in case of a string, don't do anything and just return the value.

Attestation Checklist

• My code follows the style guidelines of this project

• I have checked for/fixed spelling, linting, and other errors

• I have made corresponding changes to the documentation (updating the doc strings in the code is sufficient)

• My changes generate no new warnings

• New and existing unit tests pass locally with my changes

Additional information

Feel free to add other relevant information below

[corinagum]

Hi @jbaron thanks for the submission! It looks like there are several test failures - could you please run the tests locally and take a look? I think your solution may be having a wider area of effect than anticipated.

here's an example:

    async def test_render_as_messages(self):
        function_response_message = FunctionResponseMessage("foo", "bar")
        rendered = await function_response_message.render_as_messages(
            self.turn_context, self.memory, self.prompt_functions, GPTTokenizer(), 100
        )
        self.assertEqual(rendered.output[0].role, "function")
>       self.assertEqual(rendered.output[0].content, '"bar"')
E       AssertionError: 'bar' != '"bar"'
E       - bar
E       + "bar"

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[jbaron]

I updated the test cases and poetry run test now is successful. But:

• On my Mac I had to update the tiktoken to 0.8.0, otherwise I could not install it without compiling from source.
• Only Python 3.9 and higher is supported by this tiktoken version, so also changed this

So not sure this additional changes are desirable.

[jbaron]

I have sole ownership of intellectual property rights to my Submissions and I am not making Submissions in the course of work for my employer.

…

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