dict_attr.py

class DictAttr(object):
  def __init__(self, attrs):
    self.attrs = dict(attrs)

  def __getitem__(self, key):
    if key not in self.attrs:
      raise AttributeError

    return self.attrs[key]

  def __getattr__(self, key):
    if key not in self.attrs:
      raise AttributeError

    return self.attrs[key]

  def get(self, key, value=None):
    return self.attrs[key] if key in self.attrs else value


if __name__ == '__main__':
  d = DictAttr([('one', 1), ('two', 2), ('three', 3)])

  assert d['one'], 1
  assert d['two'], 2
  assert d['three'], 3

  assert d.one, 1
  assert d.two, 2
  assert d.three, 3

  assert d.get('one'), 1
  assert d.get('two'), 2
  assert d.get('three'), 2

  assert d.get('five', 'missing'), 'missing'

  try:
    assert d.eleven, AttributeError
  except AttributeError, e:
    pass

  try:
    assert d['eleven'], AttributeError
  except AttributeError, e:
    pass