您可能想阅读BeautifulSoup：
import bs4
# load the file
with open("existing_file.html") as inf:
txt = inf.read()
soup = bs4.BeautifulSoup(txt)
# create new link
new_link = soup.new_tag("link", rel="icon", type="image/png", href="img/tor.png")
# insert it into the document
soup.head.append(new_link)
# save the file again
with open("existing_file.html", "w") as outf:
outf.write(str(soup))
给定一个像
<html>
<head>
<title>Test</title>
</head>
<body>
<p>What's up, Doc?</p>
</body>
</html>
这产生
<html>
<head>
<title>Test</title>
<link href="img/tor.png" rel="icon" type="image/png"/></head>
<body>
<p>What's up, Doc?</p>
</body>
</html>
（注意：它已经给空白加上了小节，但是html结构正确了）。
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