cut strings and parse for images

[Andreas Volz]

Hi,

I used SGMLParser to parse all href's in a html file. Now I need to cut
some strings. For example:

http://www.example.com/dir/example.html

Now I like to cut the string, so that only domain and directory is
left over. Expected result: 

http://www.example.com/dir/

I know how to do this in bash programming, but not in python. How could
this be done?

The next problem is not only to extract href's, but also images. A href
is easy:

<a href="install.php">Install</a>

But a image is a little harder:

<img class="bild" src="images/marine.jpg">

This is my current example code:

from sgmllib import SGMLParser

leach_url = "http://stargus.sourceforge.net/"

class URLLister(SGMLParser):
	def reset(self):
		SGMLParser.reset(self)
		self.urls = []

	def start_a(self, attrs):
		href = [v for k, v in attrs if k=='href']
		if href:
			self.urls.extend(href)

if __name__ == "__main__":
	import urllib
	usock = urllib.urlopen(leach_url)
	parser = URLLister()
	parser.feed(usock.read())
	parser.close()
	usock.close()
	for url in parser.urls: 
		print url


Perhaps you've some tips how to solve this problems?

regards
Andreas