import tempfile
import mailbox
import glob

# Current behavior won't create subdir when dir exists
with tempfile.TemporaryDirectory() as d:
    m = mailbox.Maildir(d)
    print(glob.glob(d + '/*'))


# Current behavior will create dir and subdir when dir isn't exists
path = '/tmp/dir_not_exist'
m = mailbox.Maildir('/tmp/dir_not_exist')
print(glob.glob(path + '/*'))