怎么把python字典的里的所有列表值相加？题目如下，我尝试提取提取所有列表在把他们相加但是不成功，求大神解答！
def total_takings(yearly_record):
sum = 0
for key,value in yearly_record.items():
for i in value:
sum += i
return sum
sum = 0
for key,value in yearly_record.items():
for i in value:
sum += i
return sum
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