Returns list with occurrences of extensions in descending order.

Returns the number of images that are present in this album.

Allows you to bind onto the end of the process, displaying any lovely messages to your users, or carrying on with the rest of the pro

Allows you to bind a function that will be called just before an image is about to be downloaded. You'll be given the 1-indexed posit

Saves the images from the album into a folder given by foldername. If no foldername is given, it'll use the cwd and the album key.

Constructor. Pass in the album_url that you want to download.

Returns the key of this album. Helpful if you plan on generating your own folder names.