def cross(self, vector):
        """Return a Vector instance as the cross product of two vectors"""
        return Vector((self.y * vector.z - self.z * vector.y),
                      (self.z * vector.x - self.x * vector.z),
                      (self.x * vector.y - self.y * vector.x))
def cross ( self , vector ) : return Vector ( ( self . y * vector . z - self . z * vector . y ) , ( self . z * vector . x - self . x * vector . z ) , ( self . x * vector . y - self . y * vector . x ) )
Return a Vector instance as the cross product of two vectors