[Python] Error when creating python protobuf object: MergeFrom() must be instance of same class

[maxnoe]

What version of protobuf and what language are you using?

protobuf / libprotobuf 4.25.3 from conda-forge

What operating system (Linux, Windows, ...) and version?

Linux (Ubuntu 22.04)

What runtime / compiler are you using (e.g., python version or gcc version)

python, tested with multiple versions, 3.9, 3.10, 3.11

What did you do?

Minimal example:

from protozfits.CoreMessages_pb2 import AnyArray
from protozfits.R1v1_debug_pb2 import DebugCameraConfiguration

debug = DebugCameraConfiguration(
    tdp_type=AnyArray(type=AnyArray.U16, data=8 * b'\x00')
)

this fails using the latest protozfits from conda, which depends on protobuf 4.25.3, to reproduce:

$ mamba create -n proto-test python=3.11 protozfits=2.5.1
$ mamba activate proto-test
$ mamba list proto
# packages in environment at /home/mnoethe/.local/conda/envs/proto-test:
#
# Name                    Version                   Build  Channel
libprotobuf               4.25.3               h08a7969_0    conda-forge
protobuf                  4.25.3          py311h7b78aeb_0    conda-forge
protozfits                2.5.1           py311hcf1f2b2_0    conda-forge
$ python test_proto.py # contains the snippet posted above
Traceback (most recent call last):
  File "/home/mnoethe/Uni/CTA/test_protozfits.py", line 5, in <module>
    debug = DebugCameraConfiguration(
            ^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: Parameter to MergeFrom() must be instance of same class: expected AnyArray got AnyArray.

What did you expect to see
No error, code works.

What did you see instead?
The error posted above.

Anything else we should know about your project / environment

This error happens with the conda package built using conda-forge.

The python bindings code is generated using the protoc cmake integration as the project also interacts with C++ code.

This seems similar to #10040, which was closed with unclear resolution.

[maxnoe]

For some reason I don't understand, the types are not identical in the conda package, but they are in the pip package:

from protozfits.CoreMessages_pb2 import AnyArray
from protozfits.R1v1_pb2 import Event

event = Event()

print(event.waveform.__class__, id(event.waveform.__class__))
print(AnyArray, id(AnyArray))
print(id(AnyArray) == id(event.waveform.__class__))

Output in the conda env:

<class 'AnyArray'> 94075357242176
<class 'CoreMessages_pb2.AnyArray'> 94075364251936
False

Output using the PyPI package:

<class 'CoreMessages_pb2.AnyArray'> 94617635118128
<class 'CoreMessages_pb2.AnyArray'> 94617635118128
True

[shaod2]

I think there might be multiple messages out there with the same names but different path. Probably check if there're duplicates and import the correct one

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