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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 set_content(self, content, content_length=None):
 """Set content for the response. Args: content (:obj:`str` or :obj:`iterable`):
 Response content. Can be either unicode or raw bytes. When returning large content, an iterable (or a generator) can be used to avoid loading entire content into the memory. content_length (:obj:`int`, optional):
 Content length. Length will be determined if not set. If content is an iterable, it's a good practise to set the content length. """

        if content_length is not None:
            self._content_length = content_length
        self._content = content