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pylint
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refactoring
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not_checker.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 import astroid from astroid import nodes from pylint import checkers from pylint.checkers import utils class NotChecker(checkers.BaseChecker): """Checks for too many not in comparison expressions. - "not not" should trigger a warning - "not" followed by a comparison should trigger a warning """ msgs = { "C0113": ( 'Consider changing "%s" to "%s"', "unneeded-not", "Used when a boolean expression contains an unneeded negation.", ) } name = "refactoring" reverse_op = { "<": ">=", "<=": ">", ">": "<=", ">=": "<", "==": "!=", "!=": "==", "in": "not in", "is": "is not", } # sets are not ordered, so for example "not set(LEFT_VALS) <= set(RIGHT_VALS)" is # not equivalent to "set(LEFT_VALS) > set(RIGHT_VALS)" skipped_nodes = (nodes.Set,) # 'builtins' py3, '__builtin__' py2 skipped_classnames = [f"builtins.{qname}" for qname in ("set", "frozenset")] @utils.only_required_for_messages("unneeded-not") def visit_unaryop(self, node: nodes.UnaryOp) -> None: if node.op != "not": return operand = node.operand if isinstance(operand, nodes.UnaryOp) and operand.op == "not": self.add_message( "unneeded-not", node=node, args=(node.as_string(), operand.operand.as_string()), ) elif isinstance(operand, nodes.Compare): left = operand.left # ignore multiple comparisons if len(operand.ops) > 1: return operator, right = operand.ops[0] if operator not in self.reverse_op: return # Ignore __ne__ as function of __eq__ frame = node.frame(future=True) if frame.name == "__ne__" and operator == "==": return for _type in (utils.node_type(left), utils.node_type(right)): if not _type: return if isinstance(_type, self.skipped_nodes): return if ( isinstance(_type, astroid.Instance) and _type.qname() in self.skipped_classnames ): return suggestion = ( f"{left.as_string()} {self.reverse_op[operator]} {right.as_string()}" ) self.add_message( "unneeded-not", node=node, args=(node.as_string(), suggestion) )
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