Method optional_expr

mypy/treetransform.py:748–752

(self, expr: Expression | None)

    # All the node helpers also propagate line numbers.

    def optional_expr(self, expr: Expression | None) -> Expression | None:
        if expr:
            return self.expr(expr)
        else:
            return None

    def block(self, block: Block) -> Block:
        new = self.visit_block(block)