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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 write_config(self):
 """ Write config to file """

        if not os.path.exists(os.path.dirname(self.config_file)):
            os.makedirs(os.path.dirname(self.config_file))
        with open(self.config_file, 'w') as f:
            f.write(json.dumps(self.config))
            f.close()