class Color:
    def __init__(self, r, g, b):
        self.r = r
        self.g = g
        self.b = b

    def __str__(self):
        return '{}; {}; {}'.format(self.r, self.g, self.b)

class Box:
    def __init__(self, color):
        self.render_color = color

    def __str__(self):
        return '{}'.format(self.render_color)

blue = Color(*[68, 72, 134])
box = Box(blue)

print(blue) #68, 72, 134
print(box)  #68, 72, 134

box.render_color.r = 25
print(blue) #25; 72; 134
print(box)  #25; 72; 134

blue.r = 74
print(blue) #74; 72; 134
print(box)  #74; 72; 134