Class IndexExpr

mypy/nodes.py:2576–2607

Index expression x[y]. Also wraps type application such as List[int] as a special form.

class IndexExpr(Expression):
    """Index expression x[y].

    Also wraps type application such as List[int] as a special form.
    """

    __slots__ = ("base", "index", "method_type", "analyzed", "as_type")

    __match_args__ = ("base", "index")

    base: Expression
    index: Expression
    # Inferred __getitem__ method type
    method_type: mypy.types.Type | None
    # If not None, this is actually semantically a type application
    # Class[type, ...] or a type alias initializer.
    analyzed: TypeApplication | TypeAliasExpr | None
    # If this value expression can also be parsed as a valid type expression,
    # represents the type denoted by the type expression.
    # None means "is not a type expression".
    as_type: NotParsed | mypy.types.Type | None

    def __init__(self, base: Expression, index: Expression) -> None:
        super().__init__()
        self.base = base
        self.index = index
        self.method_type = None
        self.analyzed = None
        self.as_type = NotParsed.VALUE

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


class UnaryExpr(Expression):