def _get_discussion_styles(_helper_cfg):
    """This function defines (when present in the configuration) the enabled discussion styles in the environment.

    :param _helper_cfg: The configuration parsed from the helper configuration file
    :type _helper_cfg: dict
    :returns: List of enabled discussion styles in the environment
    """
    _discussion_styles = ['blog', 'contest', 'forum', 'idea', 'qanda', 'tkb']
    if 'discussion_styles' in _helper_cfg:
        if isinstance(_helper_cfg.get('discussion_styles'), list):
            _discussion_styles = _helper_cfg.get('discussion_styles')
    return _discussion_styles