function_call not handled in BaseGenerateContentResponse.text

[neilp9]

Description of the bug:

calling session.send_message returns a GenerateContentResponse object, and when this response includes a function call, response.text raises the following error:

File ".../.virtualenvs/cai/lib/python3.11/site-packages/google/generativeai/types/generation_types.py", line 538, in text
    part_type = protos.Part.pb(part).whichOneof("data")
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: whichOneof

Actual vs expected behavior:

response.text should return the text part of the response rather than throwing error. Related but separate of an issue, there should ideally be a convenience accessor for response.function_call

Any other information you'd like to share?

No response

[MarkDaoust]

The WhichOneOf error is being fixed. But .text isn't meant to handle everything. For anything remotely complicated, users should iterate over the parts and decide what to do with each one.