[web2py] embeded python code in web2py raise error

[Hojat Taheri]

hi, not to waste time, plz tell me how should i use this code in controller 
default.py :
it works in python well but in web2py error..error..error

from urllib2 import Request, urlopen, URLError

url = request.vars.url
req = Request(url)
    try:
        response = urlopen(req)
    except URLError, e:
        if hasattr(e, 'reason'):
            print 'We failed to reach a server.'
            print 'Reason: ', e.reason
        elif hasattr(e, 'code'):
            print 'The server couldn\'t fulfill the request.'
            print 'Error code: ', e.code
        else:
            print 'URL is good!'




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