所以我尝试使用join()将字符串拆分为单词和标点符号后，但它在单词和标点符号之间使用空格连接字符串。
b = ['Hello', ',', 'who', 'are', 'you', '?']
c = " ".join(b)
但这会返回：
c = 'Hello , who are you ?'
而且我要：
c = 'Hello, who are you?'
您可以先加入标点符号：
def join_punctuation(seq, characters='.,;?!'):
characters = set(characters)
seq = iter(seq)
current = next(seq)
for nxt in seq:
if nxt in characters:
current += nxt
else:
yield current
current = nxt
yield current
c = ' '.join(join_punctuation(b))
The join_punctuation生成器生成已加入任何以下标点符号的字符串：
>>> b = ['Hello', ',', 'who', 'are', 'you', '?']
>>> list(join_punctuation(b))
['Hello,', 'who', 'are', 'you?']
>>> ' '.join(join_punctuation(b))
'Hello, who are you?'
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