def freeze(self, skipSet = {}):
        # If versionStrings is in skipSet, freeze the string w/o the timestamp.
        # This is a bit of a hack to allow trove signatures to exclude
        # the timestamps. Since those timestamps are reset on the server
        # at commit time, including them would make signing the to-be-committed
        # changeset impossible.
        if not self.v:
            return ""
        elif skipSet and skipSet in 'versionStrings':
            return self.v.asString()
        else:
            return self.v.freeze()
dataset/ETHPy150Open sassoftware/conary/conary/streams.py/FrozenVersionStream.freeze/swapped operands of `in`