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File Name : bad_chained_comparison.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

from __future__ import annotations

from typing import TYPE_CHECKING

from astroid import nodes

from pylint.checkers import BaseChecker
from pylint.interfaces import HIGH

if TYPE_CHECKING:
    from pylint.lint import PyLinter

COMPARISON_OP = frozenset(("<", "<=", ">", ">=", "!=", "=="))
IDENTITY_OP = frozenset(("is", "is not"))
MEMBERSHIP_OP = frozenset(("in", "not in"))

class BadChainedComparisonChecker(BaseChecker):
    """Checks for unintentional usage of chained comparison."""

name = "bad-chained-comparison"
    msgs = {
        "W3601": (
            "Suspicious %s-part chained comparison using semantically incompatible operators (%s)",
            "bad-chained-comparison",
            "Used when there is a chained comparison where one expression is part "
            "of two comparisons that belong to different semantic groups "
            '("<" does not mean the same thing as "is", chaining them in '
            '"0 < x is None" is probably a mistake).',
        )
    }

def _has_diff_semantic_groups(self, operators: list[str]) -> bool:
        # Check if comparison operators are in the same semantic group
        for semantic_group in (COMPARISON_OP, IDENTITY_OP, MEMBERSHIP_OP):
            if operators[0] in semantic_group:
                group = semantic_group
        return not all(o in group for o in operators)

def visit_compare(self, node: nodes.Compare) -> None:
        operators = sorted({op[0] for op in node.ops})
        if self._has_diff_semantic_groups(operators):
            num_parts = f"{len(node.ops)}"
            incompatibles = (
                ", ".join(f"'{o}'" for o in operators[:-1]) + f" and '{operators[-1]}'"
            )
            self.add_message(
                "bad-chained-comparison",
                node=node,
                args=(num_parts, incompatibles),
                confidence=HIGH,
            )

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

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2023-09-24 06:26:02
..	dir	-	root/root	0755	2023-09-24 06:26:02
__pycache__	dir	-	root/root	0755	2023-09-24 06:26:02
base	dir	-	root/root	0755	2023-09-24 06:26:02
classes	dir	-	root/root	0755	2023-09-24 06:26:02
refactoring	dir	-	root/root	0755	2023-09-24 06:26:02
__init__.py	text/x-python	4.26 KB	root/root	0644	2023-09-05 09:10:14
async.py	text/x-python	3.83 KB	root/root	0644	2023-09-05 09:10:14
bad_chained_comparison.py	text/x-python	2.18 KB	root/root	0644	2023-09-05 09:10:14
base_checker.py	text/x-python	10.67 KB	root/root	0644	2023-09-05 09:10:14
deprecated.py	text/x-python	9.43 KB	root/root	0644	2023-09-05 09:10:14
design_analysis.py	text/x-python	21.62 KB	root/root	0644	2023-09-05 09:10:14
dunder_methods.py	text/x-python	3.43 KB	root/root	0644	2023-09-05 09:10:14
ellipsis_checker.py	text/x-python	1.97 KB	root/root	0644	2023-09-05 09:10:14
exceptions.py	text/x-python	26.05 KB	root/root	0644	2023-09-05 09:10:14
format.py	text/x-python	26.91 KB	root/root	0644	2023-09-05 09:10:14
imports.py	text/x-python	41.31 KB	root/root	0644	2023-09-05 09:10:14
lambda_expressions.py	text/x-python	3.38 KB	root/root	0644	2023-09-05 09:10:14
logging.py	text/x-python	15.84 KB	root/root	0644	2023-09-05 09:10:14
mapreduce_checker.py	text/x-python	1.08 KB	root/root	0644	2023-09-05 09:10:14
method_args.py	text/x-python	4.68 KB	root/root	0644	2023-09-05 09:10:14
misc.py	text/x-python	4.87 KB	root/root	0644	2023-09-05 09:10:14
modified_iterating_checker.py	text/x-python	7.67 KB	root/root	0644	2023-09-05 09:10:14
nested_min_max.py	text/x-python	3.63 KB	root/root	0644	2023-09-05 09:10:14
newstyle.py	text/x-python	4.46 KB	root/root	0644	2023-09-05 09:10:14
non_ascii_names.py	text/x-python	6.98 KB	root/root	0644	2023-09-05 09:10:14
raw_metrics.py	text/x-python	3.81 KB	root/root	0644	2023-09-05 09:10:14
similar.py	text/x-python	33.29 KB	root/root	0644	2023-09-05 09:10:14
spelling.py	text/x-python	16.17 KB	root/root	0644	2023-09-05 09:10:14
stdlib.py	text/x-python	31.28 KB	root/root	0644	2023-09-05 09:10:14
strings.py	text/x-python	40.28 KB	root/root	0644	2023-09-05 09:10:14
threading_checker.py	text/x-python	1.9 KB	root/root	0644	2023-09-05 09:10:14
typecheck.py	text/x-python	86.83 KB	root/root	0644	2023-09-05 09:10:14
unicode.py	text/x-python	18.05 KB	root/root	0644	2023-09-05 09:10:14
unsupported_version.py	text/x-python	2.93 KB	root/root	0644	2023-09-05 09:10:14
utils.py	text/x-python	77.26 KB	root/root	0644	2023-09-05 09:10:14
variables.py	text/x-python	126.57 KB	root/root	0644	2023-09-05 09:10:14