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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, section=None):
 """ Return the merged end-user configuration for this command or a specific section if set in `section`. """

        config = self.session.config
        section = self.config_section() if section is None else section
        try:
            return config[section]
        except KeyError:
            config.add_section(section)
            return config[section]