看一下怎么修改一下呀

with open('index.txt', 'r') as f:
indexList = f.read().split('\n')
indexList = [i.rstrip() for i in indexList]
errorList = []
with open('in.txt', 'r') as f:
content = f.read()
content = [i.rstrip().lower() for i in content]
article = ' '
for i in content:
if i >= 'a' and i <= 'z':
article += i
else:
article += ' '
for word in article.split():
if word not in indexList:
errorList.append(word)
errorList.sort()
with open('error.txt', 'w') as f:
for error in errorList:
f.write(error + 'n')

注意缩进：

with open('index.txt', 'r') as f:
    indexList = f.read().split('\n')
    indexList = [i.rstrip() for i in indexList]
errorList = []
with open('in.txt', 'r') as f:
    content = f.read()
    content = [i.rstrip().lower() for i in content]
    article = ' '
    for i in content:
        if i >= 'a' and i <= 'z':
            article += i
        else:
            article += ' '
    for word in article.split():
        if word not in indexList:
            errorList.append(word)
errorList.sort()
with open('error.txt', 'w') as f:
    for error in errorList:
        f.write(error + '\n')