User Agent strings in more usable format

uastring.py

def uastring(platforms, format): 
    '''
    This function is used to retrive User Agent String for various browsers/platforms from www.useragentstring.com.
    Aim of this module is to simplify using the available data.
    To find the value of the platform, visit http://useragentstring.com and get the part after /pages/
    The platform parameter should be a set of one or more platforms. Supported formats are csv, json and xml.
    '''
    import requests
    import BeautifulSoup as bsoup

    url = 'http://www.useragentstring.com/pages/'
#    platforms = {'Blackberry', 'Browser%20for%20S60'}

    browsers = []

    for platform in platforms:
        try:
            req = requests.get(url+platform+'/')
        except requests.ConnectionError, e:
            print e
        if req.status_code == 200:
            if len(req.text) > 0:
                soup = bsoup.BeautifulSoup(req.text)
                div = soup.find('div',{'id':'liste'})
                list_items = div.findAll('li')
                for item in list_items:
                    browsers.append("'"+''.join(item.findAll(text=True))+"'")
                data = _create_format(browsers,format)
                return data
            else:
                print '0 size request received'
        else:
            print 'HTTP Response code is {0}'.format(req.status_code)

def _create_format(browsers, format):
    if format == 'csv':
        return ','.join(browsers)
    elif format == 'json':
        return '{"browsers", browsers}'
        # To be completed
    elif format == 'xml':
        return ''
        #To be completed
    else:
        return 'Unsupported format'