>>>from cnotmuch import notmuch
>>>db = notmuch.Database("/home/spaetz/mail")
db.get_path()
'/home/spaetz/mail'
>>>tags = db.get_all_tags()
inited tags with 44762960 'Notmuch DB /home/spaetz/mail'
>>>for tag in tags: 
>>>  print tag
inbox
...
maildir::draft
Freeing the Tags now

#---------------------------------------------

>>>db = notmuch.Database("/home/spaetz/mailHAHA")
NotmuchError: Could not open the specified database

#---------------------------------------------

>>>tags = notmuch.Database("/home/spaetz/mail").get_all_tags()
>>>del(tags)
Freeing the Tags now
Freeing the database now