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为什么“ return list.sort()”返回None,而不返回列表?
我已经能够验证findUniqueWords结果是否为sorted list。但是,它不返回列表。为什么? def findUniqueWords(theList): newList = [] words = [] # Read a line at a time for item in theList: # Remove any punctuation from the line cleaned = cleanUp(item) # Split the line into separate words words = cleaned.split() # Evaluate each word for word in words: # …