2020-08-27 20:03:07 +0100 received badge ● Nice Question (source) 2018-11-30 17:20:45 +0100 received badge ● Famous Question (source) 2018-11-30 17:20:45 +0100 received badge ● Notable Question (source) 2018-11-30 17:20:45 +0100 received badge ● Popular Question (source) 2012-07-11 01:46:01 +0100 received badge ● Supporter (source) 2012-07-11 01:45:43 +0100 marked best answer How to construct a polynomial from string? sage: R. = QQ[] sage: f = R('x^3 - x^2 + x -1') sage: f.quo_rem(x-2) (x^2 + x + 3, 5)  2012-07-11 01:45:43 +0100 received badge ● Scholar (source) 2012-07-10 11:43:55 +0100 received badge ● Student (source) 2012-07-10 02:47:25 +0100 asked a question How to construct a polynomial from string? Hi, I can run the following (putting in a .sage file) successfully. R. = QQ[] f = x^3 - x^2 + x -1 p = x - 2 print f.quo_rem(p) But how about I have a string 'x^3 - x^2 + x -1', how can I construct f. f = SR('x^3 - x^2 + x -1') is not working as there is no member function quo_rem for Expression. Thanks.