Leave closed Trello boards for which you are not an admin

1 — readme.md

• You'll need to clone https://developers.kilnhg.com/Code/Trello/Group/TrelloSimple/ (git or Mercurial) into your working directory that contains leaveClosedBoards.py
• Get an api token

1. go here and get your Developer Key (ignore that token) https://trello.com/1/appKey/
2. visit this url, with your Developer Key inserted as shown https://trello.com/1/authorize?key=YOURDEVELOPERKEY&name=My+Application&expiration=1day&response_type=token&scope=read,write
3. grant access, and then get the token that is produced on the next page

• You'll need to add a file in the same directory called settings.py that contains strings for MY_KEY, MY_TOKEN, and USER_TOKEN (USER_TOKEN can be an empty string)
• Run the script with the last line commented out to see what boards you're leaving. When you're ready to do it for real, uncomment the last line.

2 — script.py

from TrelloSimple.trelloSimple import TrelloSimple
from settings import MY_KEY, MY_TOKEN, USER_TOKEN
from sys import argv
import json
 
token = MY_TOKEN
 
if len(argv) > 1 and argv[1] == 'user':
  token = USER_TOKEN
 
t = TrelloSimple(MY_KEY, token)
 
resp = t.get('members/me')
id_member = resp['id']
 
boards = t.get(['members','me','boards'],{'fields':'memberships,closed,name'})
 
for board in boards:
  is_closed = board['closed']
  is_admin = False
  for member in board['memberships']:
    if member['idMember'] == id_member and member['memberType'] == 'admin':
      is_admin = True
  if is_closed and not is_admin:
    print "leave board %s: %s" % (board['id'], board['name'])
    # uncomment this line when ready to delete boards
    #t.delete(['boards',board['id'],'members',id_member])

3 — settings.py

MY_KEY=""
MY_TOKEN=""
USER_TOKEN=""

commands.sh

git clone https://developers.kilnhg.com/Code/Trello/Group/TrelloSimple.git
#...edit settings.py...
pip install requests
python script.py

why trello should not handle it in his ui ?

If like me you're coming to this page looking for a way of leaving boards you are not the admin, Trello seems to have put together this: https://trello.com/support/leave-closed-board

Thanks @rlueder that saved me some time! 😀