为什么“返回list.sort()"?返回None,不是列表? [英] Why does "return list.sort()" return None, not the list?
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问题描述
我已经能够验证findUniqueWords
确实导致了排序的list
.但是,它不返回列表.为什么?
I've been able to verify that the findUniqueWords
does result in a sorted list
. However, it does not return the list. Why?
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:
# Count each unique word
if word not in newList:
newList.append(word)
answer = newList.sort()
return answer
推荐答案
list.sort
对列表进行适当排序,即不返回新列表.只需写
list.sort
sorts the list in place, i.e. it doesn't return a new list. Just write
newList.sort()
return newList
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