Python 将数字保存到文件中

这是我到目前为止的代码，除了将位置保存到文本文件中，所有操作都正常，我收到的错误消息是

sentence = raw_input("Enter a sentence: ")
sentence = sentence.lower().split()
uniquewords = []
for word in sentence:
    if word not in uniquewords:
        uniquewords.append(word)

positions = [uniquewords.index(word) for word in sentence]

recreated = " ".join([uniquewords[word] for word in positions])

positions = [x+1 for x in positions]
print uniquewords
print positions
print recreated

file = open('task2file1.txt', 'w')
file.write('\n'.join(uniquewords))
file.close()

file = open('task2file2.txt', 'w')
file.write('\n'.join(positions))
file.close()

---

将

位置

转换为字符串列表

"file.write('\n'.join(positions))
TypeError: sequence item 0: expected string, int found"

.join（）

方法只能连接字符串列表。必须将

位置

列表中的

int

s转换为字符串：

file.write('\n'.join(str(p) for p in positions))

或

---

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file.write('\n'.join(str(p) for p in positions))

file.write('\n'.join(map(str, positions)))