How to use the twitterapi.DirectMessage.NewFromJsonDict function in TwitterAPI

The twitterapi.Api instance must be authenticated.

    Args:
      user: The ID or screen name of the recipient user.
      text: The message text to be posted.  Must be less than 140 characters.

    Returns:
      A twitterapi.DirectMessage instance representing the message posted
    '''
    if not self._username:
      raise TwitterError("The twitterapi.Api instance must be authenticated.")
    url = 'http://twitter.com/direct_messages/new.json'
    data = {'text': text, 'user': user}
    json = self._FetchUrl(url, post_data=data)
    data = simplejson.loads(json)
    return DirectMessage.NewFromJsonDict(data)

'''Destroys the direct message specified in the required ID parameter.

    The twitterapi.Api instance must be authenticated, and the
    authenticating user must be the recipient of the specified direct
    message.

    Args:
      id: The id of the direct message to be destroyed

    Returns:
      A twitterapi.DirectMessage instance representing the message destroyed
    '''
    url = 'http://twitter.com/direct_messages/destroy/%s.json' % id
    json = self._FetchUrl(url, post_data={})
    data = simplejson.loads(json)
    return DirectMessage.NewFromJsonDict(data)