code: def slope(self, other):
          
          X1, Y1, X2, Y2 = self.X, self.Y, other.X, other.Y
          Y3 = Y1 - Y2
          X3 = X1 - X2
          return (Y3 * self.inverse(X3)) % self.P
docs: Determines the slope between this point and another point.
  
          Args:
              other (AffinePoint): The second point.
  
          Returns:
              int: Slope between self and other.