Parsing template

def _parse_template(tmpl_str):
    '''
    Parsing template
    '''
    tmpl_str = tmpl_str.strip()
    if tmpl_str.startswith('{'):
        tpl = salt.utils.json.loads(tmpl_str)
    else:
        try:
            tpl = salt.utils.yaml.safe_load(tmpl_str)
        except salt.utils.yaml.YAMLError as exc:
            raise ValueError(six.text_type(exc))
        else:
            if tpl is None:
                tpl = {}
    if not ('HeatTemplateFormatVersion' in tpl
            or 'heat_template_version' in tpl
            or 'AWSTemplateFormatVersion' in tpl):
        raise ValueError(('Template format version not found.'))
    return tpl