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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 _load_config_file(self):
 """Loads config.yaml from filesystem and applies some values which were set via ENV"""

        with open(self._config_file) as f:
            config = yaml.safe_load(f)
            patch_config(config, self.__environment_configuration)
            return config