Remove duplicate books (book folder) in a book directory. Require you to use "Find Duplicate" plugin first.

RemoveCalibreBookDuplicates

import os
import shutil

# Script to remove duplicate books in Calibre
# 1. Use Calibre's "Find Duplicate" plugin & run check (binary check) to remove all binary files that are duplicated
# 2. Run this script, point to the book directory.
# How it works?
# - Duplicated folders have no ebook format. They only has 2 files: image (book cover) & metadata files.
# - This script purge all folders that has less than or equal to 2 files.
#

directory = "C:YOUR_PATH_TO_DIRECTORY"

allFolders = os.listdir(directory)

tobedeletefolder_list = []
for AuthorDirectory in os.listdir(directory):
    path_author_dir = os.path.join(directory, AuthorDirectory)
    if (os.path.isdir(path_author_dir) == False):
        continue
    print("Author: " +path_author_dir)
    for bookDirectory in os.listdir(path_author_dir):
        book_directory_path = os.path.join(path_author_dir, bookDirectory)
        #print("Book:" + book_directory_path)
        allfiles = os.listdir(book_directory_path);
        if (len(allfiles)> 2):
            continue
        if os.path.isdir(book_directory_path):
            print("Book to be deleted:" + book_directory_path)
            tobedeletefolder_list.append(book_directory_path)

for path in tobedeletefolder_list:
    print("About to delete: " + path)
    shutil.rmtree(path)