suggestion about Envelope.add_attachment

[Freakwill]

1. Envelope.add_attachment could accept pathlib.Path object
2. if the path is a folder, then compress it and send the compressed file.
   Following is a part of my command line tool

path = args.pathname
if path:
    if path.is_dir():
        # compress the folder before submitting
        # compressed file is named by subject
        compath = path.parent / (args.subject+".7z")
        subprocess.run(["7z", "a", "-t7z", compath, path])
        envelope.add_attachment(str(compath))
    elif path.is_file():
        envelope.add_attachment(str(path))

    envelope.send(...)
    print('The email is sent to ...')

    if path.is_dir(): # delete the compressed file finally
        os.remove(compath)

[Freakwill]

any idea?