__init__.py 文件源码

def open_resource(name):
    """Load the object from the datastore"""
    import logging
    from cStringIO import StringIO
    try:
        data = ndb.Key('Zoneinfo', name, namespace=NDB_NAMESPACE).get().data
    except AttributeError:
        # Missing zone info; test for GMT
        # which would be there if the Zoneinfo has been initialized.
        if ndb.Key('Zoneinfo', 'GMT', namespace=NDB_NAMESPACE).get():
            # the user asked for a zone that doesn't seem to exist.
            logging.exception(
                "Requested zone '%s' is not in the database." % name)
            raise

        # we need to initialize the database
        init_zoneinfo()
        return open_resource(name)

    return StringIO(data)