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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt
"""This is the remnant of the python3 checker.
It was removed because the transition from python 2 to python3 is
behind us, but some checks are still useful in python3 after all.
See https://github.com/PyCQA/pylint/issues/5025
"""
from astroid import nodes
from pylint import checkers, interfaces
from pylint.checkers import utils
from pylint.lint import PyLinter
class EqWithoutHash(checkers.BaseChecker):
name = "eq-without-hash"
msgs = {
"W1641": (
"Implementing __eq__ without also implementing __hash__",
"eq-without-hash",
"Used when a class implements __eq__ but not __hash__. Objects get "
"None as their default __hash__ implementation if they also implement __eq__.",
),
}
@utils.only_required_for_messages("eq-without-hash")
def visit_classdef(self, node: nodes.ClassDef) -> None:
locals_and_methods = set(node.locals).union(x.name for x in node.mymethods())
if "__eq__" in locals_and_methods and "__hash__" not in locals_and_methods:
self.add_message("eq-without-hash", node=node, confidence=interfaces.HIGH)
def register(linter: PyLinter) -> None:
linter.register_checker(EqWithoutHash(linter))