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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 add_config_file(self, config_filename):
 """ Parses the content.types file and updates the content types database. :param config_filename: The path to the configuration file. """

        with open(config_filename, 'rb') as f:
            content = f.read()
            config = yaml.load(content)
            self.add_config(config, config_filename)