python - 如何分配给字典中的列表

Question

抱歉，我已经搜索过这个，看起来很简单，但我无法弄清楚。我正在尝试将值分配给我的字典中的列表:

class Test(object):
    def __init__(self):

        self.test =  { "color": ["", "", "", ""],
                          "incandescence": ["", "", "", ""] }

    def setTest(self):
        key = "color"
        print "KEY is", key
        self.test[key][0] = "TEST"

        print self.test

    def clearDict(self):  
        for key in self.test:
            self.test[key] = ""      

x = Test()
x.clearDict()
x.setTest() 

错误:第 1 行:类型错误:文件第 10 行:“str”对象不支持项目分配 #

为什么我不能将字符串分配给第 0 个元素？这与以下内容有何不同:

test = ["", "", ""]

test[0] = "test"

print test

答案:['测试', '', '']

Answer 1

在clearDict中

def clearDict(self):  
    for key in self.test:
        self.test[key] = ""  

您正在将字典元素设置为空白字符串。我想你想要这样的东西:

    def clearDict(self):  
    for key in self.test:
        for l in self.test[key]:
            self.test[key][l] = ""