class DocWrap(object):
  '''
  This class provides a simple base class for wrapper objects around opaque, 
  undocumented blobs. Instances should provide custom doc strings to make their opaque
  contents appear as a documented Python object.
  '''
  
  def __init__(self, obj, docstr):
    ''' 
    initialise DocWrap object with given opaque instance and docstring for it.
    '''
    self.__instance__ = obj
    self.__doc__ = docstr
  
  def __setattr_(self, name, value):
    if name == '__instance__':
      object.__setattr__(self, name, value)
    else:
      object.__setattr__(self.__instance__, name, value)
  
  def __getattribute__(self, name):
    if name == '__doc__':
      return object.__getattribute__(self, name)
    elif name == '__instance__':
      return object.__getattribute__(self, name)
    else:
      return object.__getattribute__(self.__instance__, name)

test= DocWrap(object(), 'hello world!')
ex = DocWrap(Exception(), 'some other type for comparison of dir() output')
print(test.__doc__) # should appear as 'hello world!'
print(dir(test))
print(dir(ex))