trello-attachment-downloader.py

from trello import TrelloClient
import requests


API_KEY = ""
API_SECRET = ""
TOKEN = ""

BOARD_NO = 0
LIST_NO = 10

client = TrelloClient(
    api_key=API_KEY,
    api_secret=API_SECRET,
    token=TOKEN
)

board = client.list_boards()[BOARD_NO]
list_id = board.list_lists()[LIST_NO].id
my_list = board.get_list(list_id)
cards = my_list.list_cards()
attachments = []
for card in cards:
    attachments.append(card.get_attachments()[0].url)

for url in attachments:
    filename = url.split('/')[-1]
    r = requests.get(url, allow_redirects=True)
    open(filename, 'wb').write(r.content)

for today, 2023, Idk why the attachment URL does not have the file extension, but this workaround worked for me.

from trello import TrelloClient
import requests


API_KEY = ""
API_SECRET = ""
TOKEN = ""

BOARD_NO = 0
LIST_NO = 10

client = TrelloClient(
    api_key=API_KEY,
    api_secret=API_SECRET,
    token=TOKEN
)

board = client.list_boards()[BOARD_NO]
list_id = board.list_lists()[LIST_NO].id
my_list = board.get_list(list_id)
cards = my_list.list_cards()
attachments = []
for card in cards:
    attachments.append(card.get_attachments()[0].url)

for url in attachments:
    filename = url.split('/')[-1]
    r = requests.get(url, allow_redirects=True)
    open(f"{filename}.jpeg", 'wb').write(r.content)