Ипатьев

def dosmth(starts, path):
    if any(x.startswith(starts) for x in os.listdir(path)):
        print "Папка " + starts

sum_game=0
sum_win=0
for row in jbs:
    sum_game +=row[0]

config = [];
with open(filename) as file:
    for line in file:
        config.append(line.rstrip());

imgs = os.listdir("images")
for file in imgs:
    img = cv.imread(f"images\{file}")
    if img is not None:
        copy = img.copy()

for item in json:
    if item['Ccy'] == 'EUR':
        break
print(item)

rates = {}
for item in json:
    rates[item['Ccy']] = item

просто в цикле продвигаться по уровням словаря не выйдет!

def changeDictValueByPath(my_dict, path, value):
    tmp_dict = my_dict
    for k in path[:-1]:
        tmp_dict = tmp_dict[k]
    tmp_dict[path[-1]] = value

indices = "first_sec_x"
source = {"first": {"sec": {"x": 1}}}
changeDictValueByPath(source, indices.split("_"), 2)
print(source);