Как увеличивать числа в Python в нескольких файлах

In file 1.html I will have $item_id = 1;
In file 2.html I will have $item_id = 2;
In file 3.html I will have $item_id = 3;
...
In file 2300.html I will have $item_id = 2300;

import os
import re
def read_text_from_file(file_path):
   """
    Aceasta functie returneaza continutul unui fisier.
    file_path: calea catre fisierul din care vrei sa citesti
    """
   with open(file_path, encoding='utf8') as f:
       text = f.read()
       return text
def write_to_file(text, file_path):
   """
    Aceasta functie scrie un text intr-un fisier.
    text: textul pe care vrei sa il scrii
    file_path: calea catre fisierul in care vrei sa scrii
    """
   with open(file_path, 'wb') as f:
       f.write(text.encode('utf8', 'ignore'))
def incrementare_fisiere_html(cale_folder_html):
   """
    Functia itereaza printr-un folder care contine fisiere html si adauga index-ul corespunzator in fiecare fisier
    """
   count = 0
   current_id = 1
   for f in os.listdir(cale_folder_html):
           if f.endswith('.html'):
               cale_fisier_html = cale_folder_html + "\\" + f
               html_text = read_text_from_file(cale_fisier_html)
               item_id_pattern = re.compile('\