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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 get_cache_key(self, offset=0, limit=0, order=None, post_slug=''):
 """ The return of Get """

        return hashlib.sha1(
            '.'.join([
                str(self._get_data_source_url()),
                str(offset),
                str(limit),
                str(order),
                str(post_slug),
                ])
        ).hexdigest()