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set_membership.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.checkers.utils import only_required_for_messages

if TYPE_CHECKING:
    from pylint.lint import PyLinter

class SetMembershipChecker(BaseChecker):
    name = "set_membership"
    msgs = {
        "R6201": (
            "Consider using set for membership test",
            "use-set-for-membership",
            "Membership tests are more efficient when performed on "
            "a lookup optimized datatype like ``sets``.",
        ),
    }

def __init__(self, linter: PyLinter) -> None:
        """Initialize checker instance."""
        super().__init__(linter=linter)

@only_required_for_messages("use-set-for-membership")
    def visit_compare(self, node: nodes.Compare) -> None:
        for op, comparator in node.ops:
            if op == "in":
                self._check_in_comparison(comparator)

def _check_in_comparison(self, comparator: nodes.NodeNG) -> None:
        """Checks for membership comparisons with in-place container objects."""
        if not isinstance(comparator, nodes.BaseContainer) or isinstance(
            comparator, nodes.Set
        ):
            return

# Heuristic - We need to be sure all items in set are hashable
        if all(isinstance(item, nodes.Const) for item in comparator.elts):
            self.add_message("use-set-for-membership", node=comparator)

def register(linter: PyLinter) -> None:
    linter.register_checker(SetMembershipChecker(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
__init__.py	text/x-python	575 B	root/root	0644	2023-09-05 09:10:14
_check_docs_utils.py	text/x-python	25.74 KB	root/root	0644	2023-09-05 09:10:14
bad_builtin.py	text/x-python	2.22 KB	root/root	0644	2023-09-05 09:10:14
broad_try_clause.py	text/x-python	2.25 KB	root/root	0644	2023-09-05 09:10:14
check_elif.py	text/x-python	2.09 KB	root/root	0644	2023-09-05 09:10:14
code_style.py	text/x-python	12.51 KB	root/root	0644	2023-09-05 09:10:14
comparetozero.py	text/x-python	3.09 KB	root/root	0644	2023-09-05 09:10:14
comparison_placement.py	text/x-python	2.3 KB	root/root	0644	2023-09-05 09:10:14
confusing_elif.py	text/x-python	1.99 KB	root/root	0644	2023-09-05 09:10:14
consider_refactoring_into_while_condition.py	text/x-python	3.23 KB	root/root	0644	2023-09-05 09:10:14
consider_ternary_expression.py	text/x-python	1.66 KB	root/root	0644	2023-09-05 09:10:14
dict_init_mutate.py	text/x-python	2.06 KB	root/root	0644	2023-09-05 09:10:14
docparams.py	text/x-python	25.3 KB	root/root	0644	2023-09-05 09:10:14
docstyle.py	text/x-python	2.87 KB	root/root	0644	2023-09-05 09:10:14
dunder.py	text/x-python	2.33 KB	root/root	0644	2023-09-05 09:10:14
empty_comment.py	text/x-python	1.91 KB	root/root	0644	2023-09-05 09:10:14
emptystring.py	text/x-python	2.9 KB	root/root	0644	2023-09-05 09:10:14
eq_without_hash.py	text/x-python	1.42 KB	root/root	0644	2023-09-05 09:10:14
for_any_all.py	text/x-python	5.69 KB	root/root	0644	2023-09-05 09:10:14
magic_value.py	text/x-python	4.14 KB	root/root	0644	2023-09-05 09:10:14
mccabe.py	text/x-python	6.89 KB	root/root	0644	2023-09-05 09:10:14
no_self_use.py	text/x-python	3.62 KB	root/root	0644	2023-09-05 09:10:14
overlapping_exceptions.py	text/x-python	3.26 KB	root/root	0644	2023-09-05 09:10:14
private_import.py	text/x-python	10.97 KB	root/root	0644	2023-09-05 09:10:14
redefined_loop_name.py	text/x-python	3.14 KB	root/root	0644	2023-09-05 09:10:14
redefined_variable_type.py	text/x-python	4 KB	root/root	0644	2023-09-05 09:10:14
set_membership.py	text/x-python	1.75 KB	root/root	0644	2023-09-05 09:10:14
typing.py	text/x-python	19.91 KB	root/root	0644	2023-09-05 09:10:14
while_used.py	text/x-python	1.07 KB	root/root	0644	2023-09-05 09:10:14