urllib2.HTTPError: HTTP Error 410: Gone

I wrote the following program in python for tweet search in python :

#Importing the modulesimport urllib2import jsonscreen_name = "wordpress"url = "https://api.twitter.com/1/statuses/user_timeline.json?screen_name="+ screen_namedata = json.load(urllib2.urlopen(url))print len(data), "tweets"for tweet in data:    print tweet['text']

But I got the following errors. I am relatively new in Python.

File "twitter.py", line 9, in <module>    data = json.load(urllib2.urlopen(url))  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen    return _opener.open(url, data, timeout)  File "/usr/lib/python2.7/urllib2.py", line 410, in open    response = meth(req, response)  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response'http', request, response, code, msg, hdrs)  File "/usr/lib/python2.7/urllib2.py", line 448, in error    return self._call_chain(*args)  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain    result = func(*args)  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)urllib2.HTTPError: HTTP Error 410: Gone

Please help.