class Vektor: 
    """ 2D Vektor Klasse """

    def __init__(self, x, y):              
        self.x = x 
        self.y = y 

    def __add__(self, other): 
        """ Ueberladener '+' Operator 

        >>> print(Vektor(3.0,4.0) + Vektor(1.0,2.0))     
        [4.0 6.0]
        """
        return Vektor( self.x+other.x, self.y+other.y )

    def __str__(self): 
        """ Ueberladene print Funktion """
        #return "[%8.6f %8.6f]" % (self.x, self.y) 
        return f"[{self.x} {self.y}]"         

if __name__ == '__main__':
    import doctest 
    doctest.testmod(verbose=True)