def __str__(self, prefix="", printElemNumber=0):
    res=""
    if self.has_key_: res+=prefix+(self.DebugFormatString(self.key_) % "Key: %s\n")
    if self.has_value_: res+=prefix+("Value: %s\n" % self.DebugFormatString(self.value_))
    return res
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/api/urlfetch_service_pb.py/URLFetchResponse_Header.__str__/swapped operands of `%`