PYTHON How to search a word on a HTML Page and make a Test

hello everyone I'm searching a special sentence or word in a html page after make a webrequest

the sentence = Couldn't resolve host 'http:'

I try to code a script using pycurl with b.getvalue() but seems doesen't works

website to try http://ift.tt/18vpPjX

code :

http://ift.tt/18vpNJ7

I would like search the total sentence or just maybe the word "http" or "Couldn't"

Thanks for your help