from notmuch2 import Database

def mailto_addrs(msg,header_name):
    hdr = msg.header(header_name)
    return 

def show_msgs(msgs):
  print("show msgs" + str(msgs))
  for msg in msgs:
      print("\t",msg.messageid)
      frm = mailto_addrs(msg,'From')
      rs = show_msgs(msg.replies())
  return 

db = Database(config=Database.CONFIG.SEARCH)
msg=db.find("87fsqijx7u.fsf@metapensiero.it")
threads = db.threads(query="thread:"+msg.threadid)
thread = next (threads)

show_msgs(thread)