[Mailman-Users] get all lists' subscribe_policy

[Xiaoyan Ma]

I need a script that gets all lists' subscribe_policy/unsubscribe_policy and outputs to a file. 
 Similar to lists_admins, but instead of getting administrator's email address, it gets 
subscribe_policy.  I looked into MailList.py, config_list, list_lists and withlist ... but have 
not figured out how to do it.  Can someone point me to the right direction?
Thanks.
Xiaoyan