def __str__(self, prefix="", printElemNumber=0):
    res=""
    if self.has_key_: res+=prefix+("key: %s\n" % self.DebugFormatString(self.key_))
    if self.has_value_: res+=prefix+(self.DebugFormatString(self.value_) % "value: %s\n")
    return res
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/appstats/datamodel_pb.py/KeyValProto.__str__/swapped operands of `%`