def docs(self, searcher, exclude_docs=None):
        alldocs = xrange(searcher.reader().doc_count_all())
        if exclude_docs is None: exclude_docs = frozenset()
        return (docnum for docnum in alldocs if docnum is exclude_docs)
dataset/ETHPy150Open dokipen/whoosh/src/whoosh/query.py/Every.docs/operator `not in` -> `is`