update: llamaindex_conversable_agent.py

[lazToum]

Why are these changes needed?

If using pydantic > 2, we get AttributeError: type object 'Config' has no attribute 'copy'
A simple check is added to avoid this.

Related issue number

Checks

• I've included any doc changes needed for https://ag2ai.github.io/ag2/. See https://ag2ai.github.io/ag2/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[marklysze]

Hey @lazToum! Thanks for putting these PRs through. Are you on Discord? If so can you connect to me, msze_, so we can send out a CLA for you?

[lazToum]

Hey @lazToum! Thanks for putting these PRs through. Are you on Discord? If so can you connect to me, msze_, so we can send out a CLA for you?

Hi @marklysze, sure, it's laztoum at discord. I have already signed one that Qingyun Wu sent me.

[marklysze]

Thanks @lazToum...

Can we provide a stricter comparison rather than directly with a string (e.g. 11.0 won't be greater 2.0):

from packaging import version
from pydantic import __version__ as pydantic_version

# This will correctly handle all future versions including v11+
if version.parse(pydantic_version) >= version.parse("2.0.0"):
...

[marklysze]

Also, I tried to change my pydantic version to a lower version and it had an issue with llama index. I think it's because BeforeValidator isn't available in older versions of pydantic and the current llamaindex libraries use it.

For llamaindex do you think it would be better to force a minimum version of 2?

[lazToum]

Yes, this sounds good. Ideally, pydantic >=2 should be in the whole project, but I don't know if this is feasible (haven't checked all the extras).