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Apparently, xP and xQ are coordinates of point on an elliptic curve over a finite field $\textrm{GF}(p)$. In this case they represent residues modulo $p$, and operation % is not defined for them. If one wants to treat them as integers, a conversion is needed: uu = int(xQ) % int(xP)

Apparently, xP and xQ are coordinates of point some points on an elliptic curve over a finite field $\textrm{GF}(p)$. In this case they represent residues modulo $p$, and operation % is not defined for them. If one wants to treat them as integers, a conversion is needed: uu = int(xQ) % int(xP)

Apparently, xP and xQ are coordinates of some points on an elliptic curve over a finite field $\textrm{GF}(p)$. In this case they represent residues modulo $p$, and operation % is not defined for them. If one wants to treat them as integers, a conversion lifting is needed: uu = int(xQ) lift(xQ) % int(xP)lift(xP)