google/generativeai/generative_models.py [629:655]:
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        self,
        *,
        response,
        history,
        generation_config,
        safety_settings,
        stream,
        tools_lib,
        request_options,
    ) -> tuple[list[protos.Content], protos.Content, generation_types.BaseGenerateContentResponse]:

        while function_calls := self._get_function_calls(response):
            if not all(callable(tools_lib[fc]) for fc in function_calls):
                break
            history.append(response.candidates[0].content)

            function_response_parts: list[protos.Part] = []
            for fc in function_calls:
                fr = tools_lib(fc)
                assert fr is not None, (
                    "Unexpected state: The function reference (fr) should never be None. It should only return None if the declaration "
                    "is not callable, which is checked earlier in the code."
                )
                function_response_parts.append(fr)

            send = protos.Content(role=_USER_ROLE, parts=function_response_parts)
            history.append(send)
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google/generativeai/generative_models.py [736:762]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        self,
        *,
        response,
        history,
        generation_config,
        safety_settings,
        stream,
        tools_lib,
        request_options,
    ) -> tuple[list[protos.Content], protos.Content, generation_types.BaseGenerateContentResponse]:

        while function_calls := self._get_function_calls(response):
            if not all(callable(tools_lib[fc]) for fc in function_calls):
                break
            history.append(response.candidates[0].content)

            function_response_parts: list[protos.Part] = []
            for fc in function_calls:
                fr = tools_lib(fc)
                assert fr is not None, (
                    "Unexpected state: The function reference (fr) should never be None. It should only return None if the declaration "
                    "is not callable, which is checked earlier in the code."
                )
                function_response_parts.append(fr)

            send = protos.Content(role=_USER_ROLE, parts=function_response_parts)
            history.append(send)
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