python实现给字典添加条目的方法

def addWord(theIndex,word,pagenumber): 
  theIndex.setdefault(word, [ ]).append(pagenumber)#存在就在基础上加入列表，不存在就新建个字典key 
 
d = {"hello":[3]} 
#d = {} 
addWord(d,"hello",3) 
addWord(d,"hello",56) 
addWord(d,"nihao",24) 
print d 

{'nihao': [24], 'hello': [3, 3, 56]}