def fetch_config(self, default, config=None):
		key = str(default) + "__" + str(config)
		if self.config_types.has_key(key):
			return self.config_types[key]
		else:
			value = fetch_local_config(default, config)
			self._add_config(value, default, config)
			return value
Return the surface pair for the given subject, surface type, and hemisphere.
dataset/ETHPy150Open Knewton/pettingzoo-python/pettingzoo/local_config.py/LocalConfigDefault.fetch_config--crossover with--dataset/ETHPy150Open gallantlab/pycortex/cortex/database.py/Database.get_surf