Tweaks - Make a cookie for python version.

Author: csev

lessons.json

@@ -249,7 +249,19 @@
             "youtube" : "-iUA4cCKRlM"
         }
     ],
-    "lti" : {
+    "lti" : [ 
+    {
+        "title" : "Autograder: Exercise 3.1",
+        "launch" : "tools/pythonauto/index.php",
+        "resource_link_id": "pythonauto_03_01",
+        "custom" : [
+            {
+                "key": "exercise",
+                "value": "3.1"
+            }
+        ]
+    },
+    {
         "title" : "Autograder: Exercise 3.3",
         "launch" : "tools/pythonauto/index.php",
         "resource_link_id": "pythonauto_03_03",
@@ -260,6 +272,7 @@
             }
         ]
     }
+    ]
 },
 {
     "title": "Functions",

tools/pythonauto/index.php

@@ -41,13 +41,17 @@
 }
 $codemirror = $editor == 1;
 
+$newpython3 = $python3;
 if ( isset($_GET['python3']) && ( $_GET['python3'] == '1' || $_GET['python3'] == '0' ) ) {
     $newpython3 = $_GET['python3']+0;
-    if ( $python3 != $newpython3 ) {
-        GradeUtil::gradeUpdateJson(array("python3" => $newpython3));
-        $json['python3'] = $newpython3;
-        $python3 = $newpython3;
-    }
+    setcookie("py4e_python_version",($newpython3+2)."", time()+3600*24*120, '/');
+} else if ( isset($_COOKIE["py4e_python_version"]) ) {
+    $newpython3 = $_COOKIE["py4e_python_version"] - 2;
+}
+if ( $python3 != $newpython3 ) {
+    GradeUtil::gradeUpdateJson(array("python3" => $newpython3));
+    $json['python3'] = $newpython3;
+    $python3 = $newpython3;
 }
 
 // Switch to boolean