soimort/you-get · error · AssertionError

not found book number: %s

Error message

not found book number: %s

What it means

The lrts.me audiobook extractor requires the URL itself to contain '/book/<digits>' — it parses the book number straight out of the URL with re.search(r"/book/(\d+)", url). When that pattern misses, it raises AssertionError('not found book number: %s') because there is no other way to address the book's AJAX pagination API.

Source

Thrown at src/you_get/extractors/lrts.py:15

#!/usr/bin/env python

__all__ = ['lrts_download']

import logging
from ..common import *
from ..util import log, term

def lrts_download(url, output_dir='.', merge=True, info_only=False, **kwargs):
    html = get_html(url)
    args = kwargs.get('args')
    if not args: args = {}
    matched = re.search(r"/book/(\d+)", url)
    if not matched:
        raise AssertionError("not found book number: %s" % url)
    book_no = matched.group(1)
    book_title = book_no
    matched = re.search(r"<title>([^-]*)[-](.*)[,](.*)</title>", html)
    if matched:
        book_title = matched.group(1)

    matched = re.search(r"var totalCount='(\d+)'", html)
    if not matched:
        raise AssertionError("not found total count in html")
    total_count = int(matched.group(1))
    log.i('%s total: %s' % (book_title, total_count))
    first_page = 0
    if ('first' in args and args.first!= None):
        first_page = int(args.first)

    page_size = 10
    if ('page_size' in args and args.page_size != None):
        page_size = int(args.page_size)

View on GitHub (pinned to 049548f3f3)

Solutions

1. Navigate to the audiobook's detail page on lrts.me and copy the URL of the form http://www.lrts.me/book/12345
2. Verify the URL contains '/book/' followed by only digits (no query junk glued to the number)
3. If the site changed its path scheme, update the regex r"/book/(\d+)" in src/you_get/extractors/lrts.py:15 to the new shape

Example fix

# before
lrts_download('http://www.lrts.me/playlist')  # AssertionError: not found book number

# after
lrts_download('http://www.lrts.me/book/12345')

import re

def is_lrts_book_url(url):
    return re.search(r'/book/\d+', url) is not None

try:
    lrts_download(url, ...)
except AssertionError as e:
    if 'not found book number' in str(e):
        print('URL must be http://www.lrts.me/book/<digits>')
    else:
        raise

When it happens

Trigger: Calling lrts_download with any URL lacking a /book/NNN path segment, e.g. 'http://www.lrts.me/book/' (no id), 'http://www.lrts.me/playlist', a chapter URL with a different path shape, or a URL where the id is non-numeric.

Common situations: Copying a listing/search URL instead of the book detail page; site restructuring paths (e.g. /audio/book/123) so the regex no longer matches; passing an already-parsed API URL.

Related errors

• not found total count in html
• Cannot find item ID
• Nothing to download here
• url
• Wrong url or unsupported link ... {0}

AI-assisted analysis of soimort/you-get@049548f3f3 (2026-08-15). Data as JSON: /api/errors/c85edf16d2608990. Report an issue: GitHub.