with the code below,
I manage to get the number of posts per author.
How to add a category filter "neuws" to this query.
In order to count the number of posts by author in the "neuws" category
Thanks for the help

```
<?php
//pour voir les journees de peches de mebres en ayant deja postees et le nombre de journees
// 1. We define the arguments to define what we want to recover
$args = array (
    'post_type' => 'post',
    'posts_per_page' => '16',

);

// 2. We run the WP Query
// The Query
$the_query = new WP_Query ($args);

// 3. we display the number of messages and the authors!
// The Loop
if ($the_query-> have_posts()) {
    //Set arguments to grab all authors with published peches, and order them by user ID
    $authorArgs = array(
        'orderby' => 'ID',
        'has_published_posts' => array('post',),

    );

    //Create an array of all authors with peches published
    $pecheAuthors = get_users($authorArgs);

    //Loop through each peche author
    foreach($pecheAuthors as $user){
        //Output user post count for peches
        echo'<font color="#f00;"><b>';
        echo count_user_posts($user->ID, 'post');
        echo'</b></font>';
        echo ' journees de pêches pour ';

        //Output user's display name
        echo'<font color="#f00;"><b>';
        echo $user->display_name;
        echo'</b></font>';
        echo '<br />';
    }

    // 3. We launch the loop to display the articles and the authors!
    // The Loop

} else {
    // no posts found
}
//wp_reset_postdata ();?
?>

```