Getting html tag value in python

Getting html tag value in python

I'm newbie to python. Here is my code working on python 2.7.5
import urllib2
import sys
url ="mydomain.com"
usock = urllib2.urlopen(url)
data = usock.read()
usock.close()
print data
Getting HTML markup like that and it works.
What I want to do is, to get value from inside <font class="big"></font>
tag. for ex. I need data value from this example:
<font class="big">Data</font>
How to do it?