google/generativeai/generative_models.py [302:314]:
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        if not contents:
            raise TypeError("contents must not be empty")

        request = self._prepare_request(
            contents=contents,
            generation_config=generation_config,
            safety_settings=safety_settings,
            tools=tools,
            tool_config=tool_config,
        )

        if request.contents and not request.contents[-1].role:
            request.contents[-1].role = _USER_ROLE
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google/generativeai/generative_models.py [356:368]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        if not contents:
            raise TypeError("contents must not be empty")

        request = self._prepare_request(
            contents=contents,
            generation_config=generation_config,
            safety_settings=safety_settings,
            tools=tools,
            tool_config=tool_config,
        )

        if request.contents and not request.contents[-1].role:
            request.contents[-1].role = _USER_ROLE
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