OpenId login with web.py fast easy simple example

#!/usr/bin/env python
import web
from web import webopenid
urls = (
'/', 'index',
'/openid', 'webopenid.host',
)

app = web.application(urls,globals())

def form(openid_loc):
  oid = status()
  if oid:
    return '''
<form action="%s" method="post">

<img alt="OpenID" src="http://openid.net/login-bg.gif"
/>
<b>%s</b>
<input name="action" type="hidden" value="logout" />
<input name="return_to" type="hidden" value="%s" />
<button type="submit">log out</button></form>
''' % (openid_loc, oid, web.ctx.fullpath)
  else:
    return '''
<form action="%s" method="post">
<input name="openid" style="background:
url("http://openid.net/login-bg.gif")
no-repeat scroll 0% 0% transparent;
padding-left: 18px;" type="text" value="" />
<input name="return_to" type="hidden" value="%s"
/>
<button type="submit">log in</button></form>
''' % (openid_loc, web.ctx.fullpath)

class index:
  def GET(self):
    oid = webopenid.status()
    if not oid:
      return 'please log in: ' + \
        webopenid.form('/openid')
    else:
      return 'you are logged in as:' + \
              webopenid.form('/openid')

if __name__ == '__main__':
  app.run()