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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_config(self):
 """ Load user configuration or return default when not found. :rtype: :class:`Configuration` """

        if not self._config:
            namespace = {}
            if os.path.exists(self.config_path):
                execfile(self.config_path, namespace)
            self._config = namespace.get('config') or Configuration()
        return self._config