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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def diff_sevice_by_text(service_name, service, environment, cf_client, repo_root):
 """ Render the local template and compare it to the template that was last applied in the target environment. """

    global ret_code

    logger.info('Investigating textual diff for `%s`:`%s` in environment `%s`',
                service['type'], service_name, environment)

    try:
        local_template = render_local_template(service_name, environment,
                                               repo_root, service['template_file'])

        current_template = fetch_current_cloudformation_template(
            service_name, environment, cf_client)

    except Exception as e:
        ret_code = 2
        logger.error(e)
        return

    ret = diff_string_templates(local_template, current_template)
    if not ret:
        logger.info('Deployed service `%s` in environment `%s` matches '
                    'the local template.', service_name, environment)
    else:
        ret_code = 1
        logger.error('Service `%s` in environment `%s` differs from '
                     'the local template.',
                     service_name, environment)
        logger.info('Change details:\n        %s', indentify(ret))