pylint-protobuf

pylint-protobuf

pylint-protobuf is a Pylint plugin for making Pylint aware of generated fields from Protobuf types.

Install

Install from PyPI via:

pip install pylint-protobuf

Add or update pylintrc to load pylint-protobuf:

[MASTER]
load-plugins=pylint_protobuf

Example

$ cat <<EOF >person.proto
message Person {
  required string name = 1;
}
EOF
$ protoc person.proto --python_out=.
$ cat <<EOF >readme.py
from person_pb2 import Person
p = Person('all arguments must be kwargs')
p.invalid_field = 'value'
p.name = 123
EOF
$ pip install pylint-protobuf
$ pylint --load-plugins=pylint_protobuf readme.py
************* Module readme
readme.py:2:4: E5904: Positional arguments are not allowed in message constructors and will raise TypeError (protobuf-no-posargs)
readme.py:3:0: E5901: Field 'invalid_field' does not appear in the declared fields of protobuf-generated class 'Person' and will raise AttributeError on access (protobuf-undefined-attribute)
readme.py:4:0: E5903: Field "Person.name" is of type 'str' and value 123 will raise TypeError at runtime (protobuf-type-error)

Supported Python Versions

pylint-protobuf supports Python 3.8 at a minimum.

Known Issues

pylint-protobuf does not currently support the following concepts:

• Some features of extensions: non-nested extensions, HasExtension(), ClearExtension(), type checking

Alternatives

mypy-protobuf

A protoc compiler plugin for generating .pyi stubs from .proto files. Fully-featured and well supported, a useful extension to a mypy workflow. May be better suited to your usecase if you control the entire pipeline. May not be suited if you are a downstream consumer of generated _pb2.py modules with no access to the original .proto definitions, in which case pylint-protobuf may be better suited for your use.