Python: how to dump cookies of a mechanize.Browser instance?

I am learning mechanize.

mechanize is a python module to automate web browsing. One of its features is automated handling of cookies. I would like a hint about the way to dump the cookies for a mechanize.Browser instance. I can't seem to figure this out myself. I need this for debug purposes.

From stackoverflow

• 
  >>> from mechanize import Browser
  >>> b = Browser()
  >>> b._ua_handlers['_cookies'].cookiejar
  mechanize._clientcookie.CookieJar[]
  >>> b.open('http://google.com')
  response_seek_wrapper at 0xb7a922ccL whose wrapped object = closeable_response at 0xb7aa070cL whose fp = socket._fileobject object at 0xb7a94224
  >>>
  >>> b._ua_handlers['_cookies'].cookiejar
  mechanize._clientcookie.CookieJar[Cookie(version=0, name='PREF', value='ID=57d545c229b4cf3f:TM=1236081634:LM=1236081634:S=p001WJMOr-V8Rlvi', port=None, port_specified=False, domain='.google.com', domain_specified=True, domain_initial_dot=True, path='/', path_specified=True, secure=False, expires=1299153634, discard=False, comment=None, comment_url=None, rest={}, rfc2109=False), Cookie(version=0, name='PREF', value='ID=20534d80a5ccf2ea:TM=1236081635:LM=1236081635:S=jW3UotZ0dg8sv6mf', port=None, port_specified=False, domain='.google.com.ua', domain_specified=True, domain_initial_dot=True, path='/', path_specified=True, secure=False, expires=1299153635, discard=False, comment=None, comment_url=None, rest={}, rfc2109=False)]
  >>>