Method group

mypy/fastparse.py:1490–1495

(self, op: str, vals: list[Expression], n: ast3.expr)

        return self.group(op, self.translate_expr_list(n.values), n)

    def group(self, op: str, vals: list[Expression], n: ast3.expr) -> OpExpr:
        if len(vals) == 2:
            e = OpExpr(op, vals[0], vals[1])
        else:
            e = OpExpr(op, vals[0], self.group(op, vals[1:], n))
        return self.set_line(e, n)

    # BinOp(expr left, operator op, expr right)
    def visit_BinOp(self, n: ast3.BinOp) -> OpExpr: