Python字典问题

Question

嗨，我很努力追加两个值到字典，请参阅下面的代码，但我想追加平均分数到他们的名字。

Question = raw_input("""How would you like to view the class? 
A) By Average, highest to lowest: 
B) By Highest score, highest to lowest: 
C) By Alphaetical order: 
""") 
Question = Question.title() 
if Question == "A" : 
    for key, value in Classdict.items(): 
     Avg = sum(map(int, value))/ float(len(value)) 
     global AvgDict 
     AvgDict = {} 
     for key in Classdict: 
      if key in AvgDict: 
       AvgDict[key].append(Avg) 
      else: 
       AvgDict[key] = Avg 
     print AvgDict 
    Classopen.close() 
    Questiontwo = raw_input("""How would yuu like to view it? 
A)By highest score, highest to lowest: 
B)By Alphaetical order: 
""") 

    Questiontwo = Questiontwo.title() 
    if Questiontwo == "A": 
     print "You selected highest score, highest to lowest" 
     sortedavghigh = sorted(AvgDict.items(), key=operator.itemgetter(1)) 
     print sortedavghigh[::-1] 
    elif Questiontwo == "B": 
     print "You selected to sort it alphabetically" 
     sortedavgapha = sorted(AvgDict.items(), key=operator.itemgetter(0)) 
     print sortedavgalpha 

Answer 1

从外观上来看，这条线是错误的：

AvgDict[key] = Avg 

我认为应该改为：

AvgDict[key] = [Avg] 

，让你有，你可以添加到列表。

所附的代码也可以写成这样，我觉得看起来有点清晰：

if key not in AvgDict: 
    AvgDict[key] = [] 
AvgDict[key].append(Avg) 

Answer 2

当值分配给AvgDict，确保你把它作为一个清单，否则，当您使用.append(Avg)，它不起作用。 一个可以implenet这样的：

AvgDict[key] = [Avg]