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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 data(self):
 """ Get a cached post-processed result of a GitHub API call. Uses Trac cache to avoid constant querying of the remote API. If a previous API call did not succeed, automatically retries after a timeout. """

        if self._next_update and datetime.now() > self._next_update:
            self.update()
        return self._data