• add a new main menu item at the admin site "Assessment Result" for example, with a submenu item "analyse assessment"
• When I click on the menu item "analyse assessment", an page is openend with three fields to fill in by the user.  and a start button.
• When I press the start button, submit to the server and from the PHP code the python scripts are executed.
• The python scripts are now creating an html page, I hope that I can embed in page of limesurvey, so that you can see the result in LimeSurvey.

1. www.limesurvey.org/manual/BeforeToolsMenuRender or create a right menu : gitlab.com/SondagesPro/managament/respon...tAndManage.php#L1770
2. Why not use survey settings ? www.limesurvey.org/manual/BeforeSurveySettings else : github.com/LimeSurvey/LimeSurvey/blob/03...PluginHelper.php#L21
3. www.limesurvey.org/manual/NewSurveySettings or PluginHelper
4. python is not PHP …

• htdocs\limesurvey\application\views\admin\survey\surveybar_view.php 
  Code:

  <!-- Extra menus from plugins -->
          <?php App()->getController()->renderPartial(
              '/admin/survey/surveybar_plugins',
              [
                  'beforeSurveyBarRender' => $beforeSurveyBarRender
              ]
          ); ?>

• htdocs\limesurvey\application\views\admin\survey\surveybar_plugins.php. I expect that the array $beforeSurveyBarRender will be filled with menu items of plugins. But were do I place these plugins? I mean in the limesurvey/plugin directory or htdocs\limesurvey\application\core\plugins\

 But I was hoping that you could point to a plugin which is adding a menu button at the top-bar menu of the Survey page. Or point me to documentation how I can do this...

call_user_func() expects parameter 1 to be a valid callback, class 'exportCompleteAnswers' does not have a method 'beforeActivate'C:\Program_Files_Portable\xampp\htdocs\limesurvey\application\libraries\PluginManager\PluginManager.php(185)173      */
174     public function dispatchEvent(PluginEvent $event, $target = array())
175     {
176         $eventName = $event->getEventName();
177         if (is_string($target)) {
178             $target = array($target);
179         }
180         if (isset($this->subscriptions[$eventName])) {
181             foreach ($this->subscriptions[$eventName] as $subscription) {
182                 if (!$event->isStopped()
183                  && (empty($target) || in_array(get_class($subscription[0]), $target))) {
184                     $subscription[0]->setEvent($event);
185                     [color=#e74c3c][b]call_user_func($subscription);[/b][/color]
186                 }
187             }
188         }
189 
190         return $event;
191     }
192 
193     /**
194      * Scans the plugin directory for plugins.
195      * This function is not efficient so should only be used in the admin interface
196      * that specifically deals with enabling / disabling plugins.
197      */

1. adding a button at the top-menu bar of the survey page.
2. and when the user click on that button, new functionality created by me will placed at that survey page with cobweb and / or barchart based on the assesment data
3. I suppose that needs to be done by an plugin, so that if we update limesurvey to a new version, these functionality is not lost.