class aliasdict(dict):
  def __init__(self, *args):
    dict.__init__(self, args)
    self._alias_table = {}

  def __getitem__(self, key):
    if key in self._alias_table:
      return dict.__getitem__(self, self._alias_table[key])
    return dict.__getitem__(self, key)

  def __setitem__(self, key, value):
    if isinstance(key, tuple):
      dict.__setitem__(self, key[0], value)
      for alias in key[1:]:
        self._alias_table[alias] = key[0]
    else:
      dict.__setitem__(self, key, value)

  def __contains__(self, key):
    if key in self._alias_table:
      return dict.__contains__(self, self._alias_table[key])
    return dict.__contains__(self, key)

if __name__ == '__main__':
  a = aliasdict()
  a['foo', 'bar', 'quux'] = 42
  print 'Test 1 passed' if a['bar'] == 42 else 'Test 1 failed'
  print 'Test 2 passed' if a['quux'] == 42 else 'Test 2 failed'
  print 'Test 3 passed' if a['foo'] == 42 else 'Test 3 failed'
  print 'Test 4 passed' if 'bar' in a else 'Test 4 failed'
  print 'Test 5 passed' if 'foo' in a else 'Test 5 failed'
  print 'Test 6 passed' if not 'trololo' in a else 'Test 6 failed'