Python3 Module Dependency Check (#11544)

* Python3 Modul Dependency Check

* code climate

* binary existance check

* move Python Modul Version Check

* .

* adding verbose argument

* args parser nicement

* enhance Validator for detailed approvements

* Update Python.php

* Update check_requirements.py

* python version to Version class
use Process

Co-authored-by: Tony Murray <murraytony@gmail.com>

LibreNMS/Util/Version.php

@@ -26,6 +26,7 @@
 namespace LibreNMS\Util;
 
 use LibreNMS\DB\Eloquent;
+use Symfony\Component\Process\Process;
 
 class Version
 {
@@ -88,4 +89,16 @@ class Version
             ? rtrim(shell_exec("git show --pretty='%ct' -s HEAD"))
             : '';
     }
+
+    public static function python()
+    {
+        $proc = new Process(['python3', '--version']);
+        $proc->run();
+
+        if ($proc->getExitCode() !== 0) {
+            return null;
+        }
+
+        return explode(' ', rtrim($proc->getOutput()), 2)[1] ?? null;
+    }
 }