title_start = contents.find('<title>')
时间: 2023-05-16 20:06:57 浏览: 45
这看起来像是一个 Python 代码片段,它的作用是在一个字符串中查找 '<title>' 的位置。如果找到了,它会返回该字符串中 '<title>' 的索引值。如果没有找到,它会返回 -1。以下是一个示例代码:
```
contents = 'This is a <title>sample</title> string'
title_start = contents.find('<title>')
if title_start != -1:
title_end = contents.find('</title>', title_start)
title = contents[title_start+len('<title>'):title_end]
print(title)
```
这个代码会输出 "sample"。
相关问题
优化代码import os import re def parse_data(contents): contents = contents.lower() title_start = contents.find('<title>') title_end = contents.find('</title>') title = contents[title_start+len('<title>'):title_end] text_start = contents.find('<text>') text_end = contents.find('</text>') text = contents[text_start+len('<text>'):text_end] return title+" "+text def read_data(path): contents = [] for filename in os.listdir(path): data = parse_data(open(path+'/'+filename, 'r').read()) filename = re.sub(r'\D', "", filename) contents.append((int(filename), data)) return contents
可以使用列表推导式和with语句来优化代码,如下所示:
import os
import re
def parse_data(contents):
contents = contents.lower()
title_start = contents.find('<title>')
title_end = contents.find('</title>')
title = contents[title_start + len('<title>'):title_end]
text_start = contents.find('<text>')
text_end = contents.find('</text>')
text = contents[text_start + len('<text>'):text_end]
return title, text
def read_data(path):
contents = [(int(re.sub(r'\D', "", filename)), parse_data(open(os.path.join(path, filename), 'r').read())) for filename in os.listdir(path)]
return contents
这样可以更加简洁和高效地实现相同的功能。
优化代码def parse_data(contents): contents = contents.lower() title_start = contents.find('<title>') title_end = contents.find('</title>') title = contents[title_start+len('<title>'):title_end] text_start = contents.find('<text>') text_end = contents.find('</text>') text = contents[text_start+len('<text>'):text_end] return title+" "+text
可以将代码进行如下优化:
def parse_data(contents):
contents = contents.lower()
title_start = contents.find('<title>')
title_end = contents.find('</title>')
title = contents[title_start + len('<title>'):title_end]
text_start = contents.find('<text>')
text_end = contents.find('</text>')
text = contents[text_start + len('<text>'):text_end]
return title + " " + text
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