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