Query Post by shortcode

shortcode query post.php

<?php 

function post_list_shortcode($atts,$content){
   
   	 extract($atts=shortcode_atts(array(
		'type' => 'post',
	),$atts) );
	
    $q = new WP_Query(
        array('posts_per_page' => '5', 'post_type' => $type)
        );		
		
		
	$list = '<ul>';
	while($q->have_posts()) : $q->the_post();
		$list .= '
		 <h2> <li><a href="'.get_permalink().'"> '.get_the_title().' </a></li> </h2>
		';        
	endwhile;
	$list.= '</ul>';
	wp_reset_query();
	return $list;
  	
	
}
add_shortcode('post','post_list_shortcode');


?>