Amogus )-

@dp.callback_query_handler(lambda c: c.data.startswith('delete_'))

@dp.callback_query_handler(lambda c: c.data == 'delete_йцукенгшщз')

with open('test.txt', 'r') as f:
    if f.read() == '':
        print('File is empty')

import os
if os.stat("file").st_size == 0:
    print('File is empty')