__init__.py 文件源码

def gettz(name):
    tzinfo = None
    if ZONEINFOFILE:
        for cachedname, tzinfo in CACHE:
            if cachedname == name:
                break
        else:
            tf = TarFile.open(ZONEINFOFILE)
            try:
                zonefile = tf.extractfile(name)
            except KeyError:
                tzinfo = None
            else:
                tzinfo = tzfile(zonefile)
            tf.close()
            CACHE.insert(0, (name, tzinfo))
            del CACHE[CACHESIZE:]
    return tzinfo