human
Complete the below
@gen.coroutine
def LoadSystemUsers(client):

    ''''Loads all system users into memory before the server starts.'
    '''

=====
Write me a the Python code you requested?
assistant
#Here is the Python code you requested.
    @gen.coroutine
    def _LoadUser(user_dict):
        identity_key = ('Email:%s' % user_dict['email'])
        identity = (yield gen.Task(Identity.Query, client, identity_key, None, must_exist=False))
        if ((identity is None) or (identity.user_id is None)):
            raise gen.Return(None)
        user = (yield gen.Task(User.Query, client, identity.user_id, None))
        raise gen.Return(user)
    global NARRATOR_USER
    NARRATOR_USER = (yield _LoadUser(_NARRATOR_USER_DICT))
    if (NARRATOR_USER is not None):
        (yield _SetWelcomeIds(NARRATOR_USER, NARRATOR_UPLOAD_PHOTOS))
        (yield _SetWelcomeIds(NARRATOR_USER, NARRATOR_UPLOAD_PHOTOS_2))
        (yield _SetWelcomeIds(NARRATOR_USER, NARRATOR_UPLOAD_PHOTOS_3))