support getting multiple illusts under same pid

[isaswa]

An artwork page for a pid could have multiple illusts under it.

But the following only return the first image url everytime:

json_result = pixiv_api.illust_detail(pid)
illust = json_result.illust
print(illust.image_urls["large"])

One can fix this by checking if json_result.illust contains meta_single_page or meta_pages fields.
If the pid correspond to an one-artwork entity, it would have data in meta_single_page but meta_pages=[].
On the other side, a multi-artwork entity would have meta_pages but no meta_single_page field at all.

here's an example:

def get_all_image_urls(pid: int) -> List[str]:
    json_result = pixiv_api.illust_detail(pid)
    multi = json_result.illust.meta_pages
    if len(multi) == 0:
        single = json_result.illust.meta_single_page
        return [single.original_image_url]
    else:
        urls = [page.image_urls.original for page in multi]
        return urls

[Xdynix]

pixivpy is simply returning what Pixiv server gave us, so we have nothing to do with the response shape.

My snippet of downloading illustrations is very similar to yours:

if illust.type == "ugoira":
    ...
elif illust.page_count == 1:
    img_urls = [illust.meta_single_page.original_image_url]
else:
    img_urls = [
        page.image_urls.original
        for page in illust.meta_pages
    ]