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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:
 def groups_setPurpose(self, *, channel: str, purpose: str, **kwargs) -> SlackResponse: """Sets the purpose for a private channel. Args: channel (str):
 The channel id. e.g. 'G1234567890' purpose (str):
 The new purpose for the channel. e.g. 'My Purpose' """

        kwargs.update({"channel": channel, "purpose": purpose})
        return self.api_call("groups.setPurpose", json=kwargs)