python - add ban reason module error dict object has no attribute append and load and save methods fail to save and load correctly -

can me adding information key in dict , updating information accordingly?

also can give me better method of saving , loading doing currently?

my current method dict key:

  def add_banreason(roomname, username, reason):     roomname = roomname.lower()     username = username.lower()     if not roomname in banr.banr_database:       banr.banr_database[roomname] = {username:reason}     else:       banr.banr_database[roomname].append({username:reason}) 

i error here saying dict object has no attribute append

i lookin result such no error:

{roomname: {username:reason, username:reason, username:reason}, roomname: {username:reason, username:reason, username:reason}} 

my current method of saving , loading:

  ### load database   def load():     banr_database = {}     open("banr.db","r") t:       data = t.read()     if data != "":       l in data.split("\n"):         a,b = l.split("):(",1)         c = [w.split(")-(") w in b.split("(:)")]         banr_database[a] = c     banr.banr_database = banr_database    ### save database   def save():     l = []     a,b in banr.banr_database.items():       c = "(:)".join([")-(".join(w) w in b])       l.append(a+"):("+c)     open("banr.db","w") t:       t.write("\n".join(sorted(l))) 

what info saved , loaded in format in given example below:

{roomname: {username:reason, username:reason, username:reason}, roomname: {username:reason, username:reason, username:reason}} 

however instead getting this:

anime-gir):(k)-(a)-(m)-(i)-(j)-(o)-(u)-(t)-(o)-(u)-(m)-(a)-(3)-(1)-(0 

the reason not there , username has been split not in dict format

can please tell me have done wrong , code appropriate here want instead of have?

banr.banr_database[roomname].update({username:reason}) 

dicts not have append ... have update should want

to save serialize data ... pickle works ... json faster though

import json db_fname = "banr.db" def load():     banr.banr_database = json.load(open(db_fname))   def save():      json.dump(banr.banr_database,open(db_fname,"w"))