Add ability for multiple compilers; add Python2

src/languages/python.js

@@ -4,9 +4,21 @@ class Python extends Language {
     constructor() {
         super('python', {
             highlight: 'py',
-            aliases: ['python', 'py']
+            aliases: ['python', 'py'],
+            loads: ['python', 'python2'],
+            options: {
+                2: () => ''
+            }
         });
     }
+
+    runWith(options) {
+        if (options.has('2')) {
+            return { id: 'python2', env: {} };
+        }
+
+        return { id: 'python', env: {} };
+    }
 }
 
 module.exports = Python;