[Shohreh]

Thanks.

This seems to do the trick:

#pip install ebooklib
import ebooklib
from ebooklib import epub
from bs4 import BeautifulSoup

INPUTFILE = "input.epub"

#epub.py UserWarning: In the future version we will turn default option ignore_ncx to True.
book = epub.read_epub(INPUTFILE,{"ignore_ncx": True})

#loop through HTML files
items = list(book.get_items_of_type(ebooklib.ITEM_DOCUMENT))
for item in items:
	print('==================================')
	print('NAME : ', item.get_name())
	print('----------------------------------')
	soup = BeautifulSoup(item.get_body_content(), 'html.parser')
	title = soup.find('h1')
	if title and title.string == "Generic title":
		title.string = "New title"
		item.set_content(soup.prettify())
	print('==================================')

epub.write_epub('edited.epub', book)