Class ComparisonExpr

mypy/nodes.py:2707–2733

Comparison expression (e.g. a < b > c < d).

class ComparisonExpr(Expression):
    """Comparison expression (e.g. a < b > c < d)."""

    __slots__ = ("operators", "operands", "method_types")

    __match_args__ = ("operands", "operators")

    operators: list[str]
    operands: list[Expression]
    # Inferred type for the operator methods (when relevant; None for 'is').
    method_types: list[mypy.types.Type | None]

    def __init__(self, operators: list[str], operands: list[Expression]) -> None:
        super().__init__()
        self.operators = operators
        self.operands = operands
        self.method_types = []

    def pairwise(self) -> Iterator[tuple[str, Expression, Expression]]:
        """If this comparison expr is "a < b is c == d", yields the sequence
        ("<", a, b), ("is", b, c), ("==", c, d)
        """
        for i, operator in enumerate(self.operators):
            yield operator, self.operands[i], self.operands[i + 1]

    def accept(self, visitor: ExpressionVisitor[T]) -> T:
        return visitor.visit_comparison_expr(self)


class SliceExpr(Expression):