Return `node`s representation as lambda expression.

def visit_Lambda(self, node: AST, dfltChaining: bool = True) -> str:
        """Return `node`s representation as lambda expression."""
        with self.op_man(node):
            src = f"lambda {self.visit(node.args)}: {self.visit(node.body)}"
            return self.wrap_expr(src, dfltChaining)