bank.py

import requests
from bs4 import BeautifulSoup

with open("bank.html") as source:
    soup = BeautifulSoup(source, "lxml")
    sum = 0
    for item in soup.div(class_="offscreen"):
        try:
            item = item.text.split(" ")[0]
            integer, fraction = item.split(",")
            num = float(integer + "." + fraction)
            if num < 0:
                sum += num
        except Exception as e:
            item = None
    print(sum)