Basic example not working

[danslinger]

I am trying to get the basic example from the README to work. I created a fresh virtual environment using Python 3.10. Installed pylint, pylint-protobuf and protobuf. The output of my pip freeze is here:

dill==0.3.5.1
isort==5.10.1
lazy-object-proxy==1.7.1
mccabe==0.7.0
platformdirs==2.5.2
protobuf==4.21.2
pylint==2.14.5
pylint-protobuf==0.20.2
tomli==2.0.1
tomlkit==0.11.1
wrapt==1.14.1

I created the person.proto file, ran protoc python_out=. person.proto and see my generated person_pb2.py file in my workspace. I created a readme.py file slightly different from the example:

from person_pb2 import Person
p = Person()
p.name = "test"

Then I run the command pylint --load-plugins=pylint_protobuf readme.py and get the following output:

************* Module readme
readme.py:1:0: E0611: No name 'Person' in module 'person_pb2' (no-name-in-module)

Since its the basic example it feels like a "me" problem, but I'm not sure where I'm running astray?

[nelfin]

Hi @danslinger, thanks for the report. It could very well be an integration issue on my end: if I remember correctly at the time of the last release (of pylint-protobuf) astroid/pylint didn't yet support Python 3.10 so I was unable to check this. I'll update my test environments and try to reproduce the issue you're seeing.

[danslinger]

Thanks for checking @nelfin . I neglected to mention I also did try this with a Python 3.8 virtual environment, and even stepped back a few versions of pylint (2.9 I think I tried).

[nelfin]

I wasn't able to reproduce this so there must be something extra that's different between our environments. It seems like your pip freeze output is missing astroid (I assume that's just a copy-paste error since pylint wouldn't work otherwise). Could you post the python.proto file and the generated person_pb2.py as well? Plus the output of protoc --version?

[danslinger]

Yeah, the missing astroid was a copy/paste error. The version is astroid==2.11.7

person.proto

syntax = "proto3";

message Person {
    string name = 1;
}

person_pb2.py

# Generated by the protocol buffer compiler.  DO NOT EDIT!
# source: person.proto
"""Generated protocol buffer code."""
from google.protobuf.internal import builder as _builder
from google.protobuf import descriptor as _descriptor
from google.protobuf import descriptor_pool as _descriptor_pool
from google.protobuf import symbol_database as _symbol_database
# @@protoc_insertion_point(imports)

_sym_db = _symbol_database.Default()




DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x0cperson.proto\"\x16\n\x06Person\x12\x0c\n\x04name\x18\x01 \x01(\tb\x06proto3')

_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'person_pb2', globals())
if _descriptor._USE_C_DESCRIPTORS == False:

  DESCRIPTOR._options = None
  _PERSON._serialized_start=16
  _PERSON._serialized_end=38
# @@protoc_insertion_point(module_scope)

protoc --version

libprotoc 3.21.2

readme.py

""" A test module"""
from person_pb2 import Person

p = Person()
p.name = "Some Name"

pylint --load-plugins=pylint_protobuf readme.py

************* Module readme
readme.py:2:0: E0611: No name 'Person' in module 'person_pb2' (no-name-in-module)

------------------------------------------------------------------
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)

Full pip freeze output

astroid==2.11.7
dill==0.3.5.1
isort==5.10.1
lazy-object-proxy==1.7.1
mccabe==0.7.0
platformdirs==2.5.2
protobuf==4.21.2
pylint==2.14.5
pylint-protobuf==0.20.2
tomli==2.0.1
tomlkit==0.11.1
wrapt==1.14.1