mapping = { 'INBOX':         'inbox'
          , 'Archive':       'archive'
          , 'Drafts':        'drafts'
          , 'Sent':          'sent'
          , 'Junk Email':    'spam'
          , 'Deleted Items': 'bin'
 }

r_mapping = { val: key for key, val in mapping.items() }

def transremote(foldername):
    return mapping.get(foldername, foldername)

def translocal(foldername):
    return r_mapping.get(foldername, foldername)

top = [ 'inbox' ]

bot = [ 'archive'
      , 'drafts'
      , 'spam'
      , 'bin'
      ]

def sort_key(d):
    folder = d['foldername']
    if folder in top:
        return top.index(folder)
    elif folder in bot:
        return 21 + bot.index(folder)
    return 20