def __init__(self, location, country_list, write_dummy=True):
        self._path = location
        self._cache = {}
        self._write_dummy = write_dummy
        if country_list:
            self._countries = dict(x.split('\t') for x in open(country_list))
        else:
            self._countries = dict()
@param write_dummy If this is true, it writes an empty pickle if there
dataset/ETHPy150Open Pinafore/qb/util/cached_wikipedia.py/CachedWikipedia.__init__