Naruto manga downloader

naruto.py

import time
import pathlib
import requests
from optparse import OptionParser

base_url = 'https://official-complete-2.eorzea.us/manga/Naruto'
consecutive_error_threshold = 5

def setup():
    parser = OptionParser()
    parser.add_option('-s', '--chapter-start', dest='chapter_start', default=1)
    parser.add_option('-e', '--chapter-end', dest='chapter_end', default=700)
    parser.add_option('-o', '--output-path', dest='output_path', default='naruto')
    parser.add_option('-c', '--chapter-wait-duration', dest='chapter_sleep_duration', default=30)
    parser.add_option('-p', '--page-wait-duration', dest='page_sleep_duration', default=1)
    return parser.parse_args()

def page_url(chapter, page):
    # 0-pad the chapters and pages as necessary.
    return f'{base_url}/{chapter:04}-{page:03}.png'

def main():
    (options, args) = setup()
    output_path = options.output_path
    chapters = range(int(options.chapter_start), int(options.chapter_end) + 1)
    chapter_sleep_duration = int(options.chapter_sleep_duration)
    page_sleep_duration = int(options.page_sleep_duration)
    consecutive_error_counter = 0

    for chapter in chapters:
        print(f'starting download for chapter {chapter}')
        chapter_path = f'{output_path}/{chapter}'
        pathlib.Path(chapter_path).mkdir(exist_ok=True, parents=True) # mkdir -p
        page = 1

        while True:
            if consecutive_error_counter >= consecutive_error_threshold:
                raise Exception(f'we got {consecutive_error_counter} errors in a row. something is wrong!')

            print(f'downloading page {page}')
            request = requests.get(page_url(chapter, page), stream=True)

            if request.ok:
                with open(f'{chapter_path}/{page}.png', 'wb') as f:
                    for chunk in request.iter_content(chunk_size=128):
                        f.write(chunk)
                page += 1
                consecutive_error_counter = 0
                time.sleep(page_sleep_duration)
            else:
                print(f'error getting page #{page}! (it probably doesn\'t exist)')
                print(f'received status code: {request.status_code} - {request.reason}. next chapter!')
                consecutive_error_counter += 1
                break
        
        print(f'wait {chapter_sleep_duration}s')
        time.sleep(chapter_sleep_duration)
    
    return 0

if __name__ == '__main__':
    try:
        exit(main())
    except KeyboardInterrupt:
        print('abort!')
        exit(1)
    except Exception as e:
        raise e

thank you!