TypeError：序列項12：預期的str實例，找不到NoneType

Question

這是我的代碼：

import re
with open('newfiles.txt') as f:
    s = f.read()
uniquelist = []
error = re.findall(r"[\w]+|[^\s\w]", (s))
for word in error:
    if word not in uniquelist:
        uniquelist.append(word)
print ("Here are the words in their first appearing index form: ")
my_indexes = ' '.join(str(uniquelist.index(word)+1) for word in error)
print (my_indexes)
file = open("newfiletwo.txt","w")
file.write (' '.join(str(my_indexes)))
file.close()
file = open("newfilethree.txt","w")
file.write(' '.join(uniquelist))
file.close()
word_base = None
with open('newfilethree.txt', 'rt') as f_base:
    word_base = [None] + [z.strip() for z in f_base.read().split()]
sentence_seq = None
with open('newfiletwo.txt', 'rt') as f_select:
   sentence_seq = [word_base[int(i)] for i in f_select.read().split()]
print(my_indexes)
print(' '.join(sentence_seq))

它獲取一個文本文件，並返回其中的單詞和標點的位置（索引）。 如果重復，則給出第一個遇到的位置索引。 這樣，就打印出索引。 其次，在將單獨的單詞保存為文件和索引列表之后，我嘗試使用它們重新創建文本。 因此，最終輸出應該是標點符號本身的原始句子。 但是不幸的是，當程序運行到最后一行代碼時，出現此錯誤：

Traceback (most recent call last):
    File "E:\Python\Final.py", line 26, in <module>
        print(' '.join(sentence_seq))
TypeError: sequence item 12: expected str instance, NoneType found

有人知道問題出在哪里嗎？

Answer 1

您可以如下包裝該print(" ".join(sentence_seq))並發布結果：

try: 
    print(" ".join(sentence_seq)) 
except TypeError: 
    print("Broken sentence: " + repr(sentence_seq))
    raise

請參閱repl.it上的示例

---

這不是修復程序 （但與上面類似，對於進行故障排除可能很有用）：

print(" ".join(filter(None, sentence_seq)))

將刪除None ，但不會解決為什么它們首先為None原因。

---

這是一個解決方法 ：

my_indexes = ' '.join(str(uniquelist.index(word)) for word in error)

和

word_base = [z.strip() for z in f_base.read().split()]

您要在索引中添加1，然后在列表的開頭添加“ None ” ...刪除不再重現的兩個問題。

Answer 2

這不是答案，這僅是為了方便查看-Bjorn這是顯示的結果：

   'They' <class 'str'>
   'say' <class 'str'>
   'it' <class 'str'>
   "'" <class 'str'>
   's' <class 'str'>
   'a' <class 'str'>
   'dog' <class 'str'>
   "'" <class 'str'>
   's' <class 'str'>
   'life' <class 'str'>
   ',' <class 'str'>
   'They' <class 'str'>
   None <class 'NoneType'>
   'They' <class 'str'>
   'They' <class 'str'>
   'They' <class 'str'>
   'say' <class 'str'>

它輸出上面顯示的內容，但是程序的目的是打印此內容：

   They say it's a dog's life, but for Estrella, born without her front legs, she's adapted to more of a kangaroo way of living. The Peruvian mutt hasn't let her disability hold her back, gaining celebrity status in the small town of Tinga Maria.