我必须做很多工作才能像这样改变:
<img src = "/" height="111" width="10" />
到
<img src = "/" height="222" width="20" />
所以我想用python Regular 这是我的代码:
import re
s = '<img src = "werwerwe" height="111" width="10" />'
def a(x):
print x.group(2)
print x.group(4)
ss = re.sub(r'''<img.*(width\s*="?(\d+)"?)*\s*(height\s*="?(\d+)"?)*''',a, s)
print ss
那我该怎么办呢，
谢谢
更新:
现在可以了:
import re
s = '<img src = "/" height="111" width="10" />'
def a(x):
b = x.group(0)
b = b.replace(x.group(1),str(int(x.group(1))*2))
b = b.replace(x.group(2),str(int(x.group(2))*2))
return b
ss = re.sub(r'''<img.*?height=\"(\d+)\".*?width=\"(\d+)\"[^>]*>''',a, s)
print ss
最佳答案
不要使用正则表达式来解析 HTML。使用 BeautifulSoup
>>> from BeautifulSoup import BeautifulSoup
>>> ht = '<html><head><title>foo</title></head><body><p>whatever: <img src="foo/img.png" height="111" width="22" /></p><ul><li><img src="foo/img2.png" height="32" width="44" /></li></ul></body></html>'
>>> soup = BeautifulSoup(ht)
>>> soup
<html><head><title>foo</title></head><body><p>whatever: <img src="foo/img.png" height="111" width="22" /></p><ul><li><img src="foo/img2.png" height="32" width="44" /></li></ul></body></html>
>>> soup.findAll('img')
[<img src="foo/img.png" height="111" width="22" />, <img src="foo/img2.png" height="32" width="44" />]
>>> for img in soup.findAll('img'):
... ht = int(img['height'])
... wi = int(img['width'])
... img['height'] = str(ht * 2)
... img['width'] = str(wi * 2)
...
...
>>> print soup.prettify()
<html>
<head>
<title>
foo
</title>
</head>
<body>
<p>
whatever:
<img src="foo/img.png" height="222" width="44" />
</p>
<ul>
<li>
<img src="foo/img2.png" height="64" width="88" />
</li>
</ul>
</body>
</html>
>>>
关于python - 如何使用python Regular使宽度和高度x2，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/5877717/