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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_analysis_config(self, group_name):
 """ Gets any config data saved for the analysis. :param group_name: The name of the analysis group. :returns: A dictionary of dictionaries. Each key represents an analysis step. Each value is a dictionary containing the analysis parameters as key/value pairs. Returns None if no configuration exists for the analysis. """

        self.assert_open()
        group = 'Analyses/{}/Configuration'.format(group_name)
        config = None
        if group in self.handle:
            config = self._parse_attribute_tree(group)
        return config