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How to construct a polynomial from string?


I can run the following (putting in a .sage file) successfully.

R.<x> = 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.