Isinstance doesn't work when python reflection protobuf v2.6.1 is used
I am using python protobuf v2.6.1 dynamic reflection functions and have a function as below:
# initilization code
des_db_ = descriptor_database.DescriptorDatabase()
des_pool_ = descriptor_pool.DescriptorPool(des_db_)
fdp = descriptor_pb2.FileDescriptorProto.FromString(
a_pb_module.DESCRIPTOR.serialized_pb)
des_db_.Add(fdp)
def unpack_PB_msg(type_name, pb_msg_str)
factory = message_factory.MessageFactory(des_pool_)
msg_class = factory.GetPrototype(des_pool_.FindMessageTypeByName(type_name))
pb_msg = msg_class()
pb_msg.ParseFromString(pb_msg_str)
return pb_msg
But the following client code will fail
hello = Hello_msg()
hello_str = hello.SerializeToString()
hello2 = unpack_PB_msg(Hello_msg.DESCRIPTOR.full_name, hello_str)
hello3 = Hello_msg()
hello3.CopyFrom(hello2)# failed here!!!
Error message:
hello3.CopyFrom(hello2)
File "C:\Localdata\Python27\lib\site-packages\google\protobuf\message.py", line 119, in CopyFrom
self.MergeFrom(other_msg)
File "C:\Localdata\Python27\lib\site-packages\google\protobuf\internal\python_message.py", line 971, in MergeFrom
"expected %s got %s." % (cls.__name__, type(msg).__name__))
TypeError: Parameter to MergeFrom() must be instance of same class: expected Hello_msg got Hello_msg.
It seems that CopyFrom is failing because isinstance is failing.
def MergeFrom(self, msg):
if not isinstance(msg, cls):
raise TypeError(
"Parameter to MergeFrom() must be instance of same class: "
"expected %s got %s." % (cls.__name__, type(msg).__name__))
When data like hello2 and hello3 are printed, they appear to be different.
hello2 : <class 'Hello_msg'>
hello3 : <class 'a_pb_module.Hello_msg'>
Is this a protobuf bug? or did I do something wrong?
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