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overlapping_exceptions.py

# 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

"""Looks for overlapping exceptions."""

from __future__ import annotations

from typing import TYPE_CHECKING, Any

import astroid
from astroid import nodes, util

from pylint import checkers
from pylint.checkers import utils
from pylint.checkers.exceptions import _annotated_unpack_infer

if TYPE_CHECKING:
    from pylint.lint import PyLinter

class OverlappingExceptionsChecker(checkers.BaseChecker):
    """Checks for two or more exceptions in the same exception handler
    clause that are identical or parts of the same inheritance hierarchy.

(i.e. overlapping).
    """

name = "overlap-except"
    msgs = {
        "W0714": (
            "Overlapping exceptions (%s)",
            "overlapping-except",
            "Used when exceptions in handler overlap or are identical",
        )
    }
    options = ()

@utils.only_required_for_messages("overlapping-except")
    def visit_tryexcept(self, node: nodes.TryExcept) -> None:
        """Check for empty except."""
        for handler in node.handlers:
            if handler.type is None:
                continue
            if isinstance(handler.type, astroid.BoolOp):
                continue
            try:
                excs = list(_annotated_unpack_infer(handler.type))
            except astroid.InferenceError:
                continue

handled_in_clause: list[tuple[Any, Any]] = []
            for part, exc in excs:
                if isinstance(exc, util.UninferableBase):
                    continue
                if isinstance(exc, astroid.Instance) and utils.inherit_from_std_ex(exc):
                    exc = exc._proxied

if not isinstance(exc, astroid.ClassDef):
                    continue

exc_ancestors = [
                    anc for anc in exc.ancestors() if isinstance(anc, astroid.ClassDef)
                ]

for prev_part, prev_exc in handled_in_clause:
                    prev_exc_ancestors = [
                        anc
                        for anc in prev_exc.ancestors()
                        if isinstance(anc, astroid.ClassDef)
                    ]
                    if exc == prev_exc:
                        self.add_message(
                            "overlapping-except",
                            node=handler.type,
                            args=f"{prev_part.as_string()} and {part.as_string()} are the same",
                        )
                    elif prev_exc in exc_ancestors or exc in prev_exc_ancestors:
                        ancestor = part if exc in prev_exc_ancestors else prev_part
                        descendant = part if prev_exc in exc_ancestors else prev_part
                        self.add_message(
                            "overlapping-except",
                            node=handler.type,
                            args=f"{ancestor.as_string()} is an ancestor class of {descendant.as_string()}",
                        )
                handled_in_clause += [(part, exc)]

def register(linter: PyLinter) -> None:
    linter.register_checker(OverlappingExceptionsChecker(linter))

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-02-05 09:38:42
..	dir	-	root/root	0755	2026-02-05 09:38:42
__pycache__	dir	-	root/root	0755	2026-02-05 09:38:42
__init__.py	text/x-script.python	575 B	root/root	0644	2026-01-20 01:01:48
_check_docs_utils.py	text/x-script.python	25.74 KB	root/root	0644	2026-01-20 01:01:48
bad_builtin.py	text/x-script.python	2.22 KB	root/root	0644	2026-01-20 01:01:48
broad_try_clause.py	text/x-script.python	2.25 KB	root/root	0644	2026-01-20 01:01:48
check_elif.py	text/x-script.python	2.09 KB	root/root	0644	2026-01-20 01:01:48
code_style.py	text/x-script.python	12.51 KB	root/root	0644	2026-01-20 01:01:48
comparetozero.py	text/x-script.python	3.09 KB	root/root	0644	2026-01-20 01:01:48
comparison_placement.py	text/x-script.python	2.3 KB	root/root	0644	2026-01-20 01:01:48
confusing_elif.py	text/x-script.python	1.99 KB	root/root	0644	2026-01-20 01:01:48
consider_refactoring_into_while_condition.py	text/x-script.python	3.23 KB	root/root	0644	2026-01-20 01:01:48
consider_ternary_expression.py	text/x-script.python	1.66 KB	root/root	0644	2026-01-20 01:01:48
dict_init_mutate.py	text/x-script.python	2.06 KB	root/root	0644	2026-01-20 01:01:48
docparams.py	text/x-script.python	25.3 KB	root/root	0644	2026-01-20 01:01:48
docstyle.py	text/x-script.python	2.87 KB	root/root	0644	2026-01-20 01:01:48
dunder.py	text/x-script.python	2.33 KB	root/root	0644	2026-01-20 01:01:48
empty_comment.py	text/x-script.python	1.91 KB	root/root	0644	2026-01-20 01:01:48
emptystring.py	text/x-script.python	2.9 KB	root/root	0644	2026-01-20 01:01:48
eq_without_hash.py	text/x-script.python	1.42 KB	root/root	0644	2026-01-20 01:01:48
for_any_all.py	text/x-script.python	5.69 KB	root/root	0644	2026-01-20 01:01:48
magic_value.py	text/x-script.python	4.14 KB	root/root	0644	2026-01-20 01:01:48
mccabe.py	text/x-script.python	6.89 KB	root/root	0644	2026-01-20 01:01:48
no_self_use.py	text/x-script.python	3.62 KB	root/root	0644	2026-01-20 01:01:48
overlapping_exceptions.py	text/x-script.python	3.26 KB	root/root	0644	2026-01-20 01:01:48
private_import.py	text/x-script.python	10.97 KB	root/root	0644	2026-01-20 01:01:48
redefined_loop_name.py	text/x-script.python	3.14 KB	root/root	0644	2026-01-20 01:01:48
redefined_variable_type.py	text/x-script.python	4 KB	root/root	0644	2026-01-20 01:01:48
set_membership.py	text/x-script.python	1.75 KB	root/root	0644	2026-01-20 01:01:48
typing.py	text/x-script.python	19.91 KB	root/root	0644	2026-01-20 01:01:48
while_used.py	text/x-script.python	1.07 KB	root/root	0644	2026-01-20 01:01:48

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