#NEWLINE# def __neg__( self ) : #NEWLINE# #INDENT# 'Returns the negation of this vector (a vector pointing in the opposite direction.\n        eg v1 = Vector(1,2,3)\n        print -v1\n        >>> (-1,-2,-3)\n\n        ' #NEWLINE# ( x , y , z ) = self . _v #NEWLINE# return self . from_floats ( ( - x ) , ( - y ) , ( - z ) )