Split a folder with many files into subfolders with N files. Usage: python folder_splitter.py path/to/target/folder

folder_splitter.py

# -*- coding: utf-8 -*-
# @author: Peter Lamut

import argparse
import os
import shutil

N = 10  # the number of files in seach subfolder folder


def move_files(abs_dirname):
    """Move files into subdirectories."""

    files = [os.path.join(abs_dirname, f) for f in os.listdir(abs_dirname)]

    i = 0
    curr_subdir = None

    for f in files:
        # create new subdir if necessary
        if i % N == 0:
            subdir_name = os.path.join(abs_dirname, '{0:03d}'.format(i / N + 1))
            os.mkdir(subdir_name)
            curr_subdir = subdir_name

        # move file to current dir
        f_base = os.path.basename(f)
        shutil.move(f, os.path.join(subdir_name, f_base))
        i += 1


def parse_args():
    """Parse command line arguments passed to script invocation."""
    parser = argparse.ArgumentParser(
        description='Split files into multiple subfolders.')

    parser.add_argument('src_dir', help='source directory')

    return parser.parse_args()


def main():
    """Module's main entry point (zopectl.command)."""
    args = parse_args()
    src_dir = args.src_dir

    if not os.path.exists(src_dir):
        raise Exception('Directory does not exist ({0}).'.format(src_dir))

    move_files(os.path.abspath(src_dir))


if __name__ == '__main__':
    main()

I combined @hyzyla's python3 edit

With python3, I got error

    subdir_name = os.path.join(abs_dirname, '{0:03d}'.format(i / N + 1))
ValueError: Unknown format code 'd' for object of type 'float'

Fixed by updating line 22:

subdir_name = os.path.join(abs_dirname, '{0:03d}'.format(i // N + 1))

with @ajeema's sequential edit

If anyone has sequential images that you want to keep order, replace line 14 with:

files = sorted([os.path.join(abs_dirname, f) for f in os.listdir(abs_dirname)])

and it was EXACTLY what I needed to peruse thousands of images without crashing Explorer every time it tries to load the thumbnails. Tysm!