python - python在类中获取/设置类变量

Question

我不知道如何访问另一个类对象中的类对象。给定一个“最佳结果”类，其中包括

1. 一个整数值
2. “颜色”类的数组

如下面的代码所示。我的问题是：

(A) 在 "Best Result" def "SetColors" 类中，如何将 self.colors 初始化为颜色大小？下面的代码似乎分配了空列表，所以当我将参数“colors”复制到“self.colors”时，它说“index out of range”。另外，深拷贝是正确的方法吗？

  self.colors = list(colors)
  for i in range(0, len(colors)):
    self.colors[i]= copy.deepcopy(colors[i])  

(B) 如何在“Best Result”类中设置和获取“Color”类的数组？

---

感谢您的评论，我尝试改进代码并在下面得到我的问题的答案。

---

import copy

class Color(object):
    __elems__ = "num", "nodelist"

    def __init__(self):
        self.num = 0                    
        self.nodelist = []              

    def items(self):
        return [
            (field_name, getattr(self, field_name)) 
             for field_name in self.__elems__]

class BestResult(object):
    __elems__ = "objfunc", "colors"

    def __init__(self):
        self.objfunc = 0        
        self.colors = []              

    def setObjFunc(self, value):
        if value < self.objfunc:
            self.objfunc = value

    def getObjFunc(self):
        return self.objfunc

    def setColors(self, colors):
        # Q1: How to initialize self.colors to size of colors? Index out of range now as self.colors has zero length.
        self.colors = list(colors)    
        for i in range(0, len(colors)):
            # Q2: Is this the right way to copy class?
            self.colors[i]= copy.deepcopy(colors[i])   

    def getColors(self):
        return self.colors

def funcA():

    br = []
    br.append(BestResult())

    colors = []
    colors.append(Color())
    colors[0].num = 5
    colors[0].nodelist = [10, 20 , 30 , 40, 50]

    colors.append(Color())
    colors[1].num = 2
    colors[1].nodelist = [6, 7]

    br[0].setObjFunc(-100)

    # Q3: How to set colors[0] and colors[1] into br's colors?          
    br[0].setColors(colors)       

    print("br=%d" %br[0].getObjFunc())
    # Q4 How to retrieve each elements of (num & nodelist) in br[0].colors
    res = br[0].getColors()
    print res[0].num
    print res[0].nodelist
    print res[1].num
    print res[1].nodelist   


if __name__ == '__main__':
    funcA()