If anyone here knows anything about canonical divisors and their 
implementation in Sage, please see 
https://ask.sagemath.org/question/74034/converting-algebraic-geometry-magmas-code-to-sage/.
 
The setup:

sage: P2.<x,y,z> = ProjectiveSpace(QQ, 2)
sage: f = 2*x^5 - 4*x^3*y*z + x^2*y*z^2 + 2*x*y^3*z + 2*x*y^2*z^2+ y^5
sage: C = P2.curve(f)

How do you get the canonical divisor for C?

(I encourage you to post answers directly to ask.sagemath.org, if you're 
willing.)

-- 
John

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