code: def safe_concurrent_rename(src, dst):
    
    # Delete dst, in case it existed (with old content) even before any concurrent processes
    # attempted this write. This ensures that at least one process writes the new content.
    if os.path.isdir(src):  # Note that dst may not exist, so we test for the type of src.
      safe_rmtree(dst)
    else:
      safe_delete(dst)
    try:
      shutil.move(src, dst)
    except IOError as e:
      if e.errno != errno.EEXIST:
        raise
docs: Rename src to dst, ignoring errors due to dst already existing.
  
    Useful when concurrent processes may attempt to create dst, and it doesn't matter who wins.