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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 async def get_chat(self):
 """ Returns `chat`, but will make an API call to find the chat unless it's already cached. """

        # See `get_sender` for information about 'min'.
        if (self._chat is None or getattr(self._chat, 'min', None))\
                and await self.get_input_chat():
            try:
                self._chat =\
                    await self._client.get_entity(self._input_chat)
            except ValueError:
                await self._refetch_chat()
        return self._chat