TypeError：序列项 12：预期的 str 实例，找到 NoneType

Question

这是我的代码：

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))

它接受一个文本文件并返回其中的单词和标点符号的位置（索引）。如果某事重复，则给出第一次遇到的位置索引。所以它，打印出索引。其次，在将分隔的单个单词保存为文件和索引列表之后，我尝试使用它们重新创建文本。所以最终的输出应该是带有标点符号的原始句子。但不幸的是，当程序运行最后一行代码时，我得到了这个错误：

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

有谁知道问题出在哪里？

Answer 1

你能把 print(" ".join(sentence_seq)) 包装成下面这样并发布结果吗：

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

查看repl.it上的示例

---

这不是修复方法（但可能对故障排除有用，如上所示）：

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

将删除Nones，但不会解决为什么它们首先是None。

---

这是一个修复：

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

&

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

您将 1 添加到索引，然后将 None 添加到列表的开头...通过删除这两个问题不再重现。

Answer 2

这不是答案，这只是为了方便观看 - Bjorn 这是显示的结果：

   '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'>

它输出上面显示的内容，但程序的目的是打印这个：

   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.