如何引入类python

class Color(object):

    def __init__(self, red, green, blue):

        self.red = red;

        self.green = green;

        self.blue = blue;

    def __str__(self):

        return '(%s,%s,%s)' %(self.red, self.green, self.blue);

import sys;

sys.path.append('/Users/chuxing/python/test');

from Color import Color;

class Food(object):

    def __init__(self, color):

        self.color = color;

    def __str__(self):

        return '(%s)' %self.color;

black = Color(1,2,3);

drink = Food(black);

print(drink);

import sys;sys.path.append('/Users/chuxing/python/test');

from Color import Color;