Support pylint v3

in pylint v3.0.0, there is pylint-dev/pylint#8404, that breaks the current implementation of:
- ClassAttrLoader
- FixtureChecker
This fix is an attempt of supporting both pylint v2 and v3

pylint_pytest/checkers/__init__.py

@@ -1,5 +1,13 @@
+import pylint
 from pylint.checkers import BaseChecker
 
 
 class BasePytestChecker(BaseChecker):
+    if int(pylint.version.split(".")[0]) < 3:
+        # Since https://github.com/pylint-dev/pylint/pull/8404, pylint does not need this
+        # __implements__ pattern. keeping it for retro compatibility with pylint==2.x
+        from pylint.interfaces import IAstroidChecker  # pylint: disable=import-outside-toplevel
+
+        __implements__ = IAstroidChecker
+
     name = "pylint-pytest"

pylint_pytest/checkers/class_attr_loader.py

@@ -1,14 +1,12 @@
 from typing import Optional, Set
 
 from astroid import Assign, Attribute, ClassDef, Name
-from pylint.interfaces import IAstroidChecker
 
 from ..utils import _can_use_fixture, _is_class_autouse_fixture
 from . import BasePytestChecker
 
 
 class ClassAttrLoader(BasePytestChecker):
-    __implements__ = IAstroidChecker
     msgs = {"E6400": ("", "pytest-class-attr-loader", "")}
 
     in_setup = False

pylint_pytest/checkers/fixture.py

@@ -8,7 +8,6 @@
 import pylint
 import pytest
 from pylint.checkers.variables import VariablesChecker
-from pylint.interfaces import IAstroidChecker
 
 from ..utils import (
     _can_use_fixture,
@@ -42,7 +41,6 @@ def pytest_collectreport(self, report):
 
 
 class FixtureChecker(BasePytestChecker):
-    __implements__ = IAstroidChecker
     msgs = {
         "W6401": (
             "Using a deprecated @pytest.yield_fixture decorator",

setup.py

@@ -28,7 +28,7 @@
     long_description_content_type="text/markdown",
     packages=find_packages(exclude=["tests*", "sandbox"]),
     install_requires=[
-        "pylint<3",
+        "pylint>=2",
         "pytest>=4.6",
     ],
     python_requires=">=3.6",

tox.ini

@@ -1,5 +1,11 @@
 [tox]
-envlist = py36,py37,py38,py39,py310,py311
+envlist =
+    py36-pylint2
+    py37-pylint2
+    py38-pylint{2,3}
+    py39-pylint{2,3}
+    py310-pylint{2,3}
+    py311-pylint{2,3}
 skipsdist = True
 passenv =
     FORCE_COLOR
@@ -8,6 +14,8 @@ passenv =
 deps =
     pytest
     pytest-cov
+    pylint2: pylint>2,<3
+    pylint3: pylint>3,<4
 commands =
     pip install --upgrade --editable .
     pytest --cov --cov-append {env:PYTEST_CI_ARGS:} {tty:--color=yes} {posargs:tests}