Merge 2 directories in python

import os
import shutil

def move_merge_dirs(source_root, dest_root):
    for path, dirs, files in os.walk(source_root, topdown=False):
        dest_dir = os.path.join(
            dest_root,
            os.path.relpath(path, source_root)
        )
        if not os.path.exists(dest_dir):
            os.makedirs(dest_dir)
            
        for filename in files:
            destFile = os.path.join(dest_dir, filename)
            if os.path.isfile(destFile):
                continue
            os.rename(os.path.join(path, filename), destFile)
            
        for dirname in dirs:
            # remove the source dir since all its contents were moved or are already existent
            shutil.rmtree(os.path.join(path, dirname))
    os.rmdir(source_root)

Sources:
https://stackoverflow.com/a/22588775/2287841
https://unix.stackexchange.com/questions/127712/merging-folders-with-mv/510724#510724