add fold detection rules for python and c style languages

lib/ace/mode/python.js

@@ -52,6 +52,11 @@ oop.inherits(Mode, TextMode);
 
 (function() {
 
+    this.foldingRules = {
+        foldingStartMarker: /\:(:?\s*)?(:?#.*)?$/,
+        getFoldWidgetRange: "indentationBlock"
+    };
+
     this.toggleCommentLines = function(state, doc, startRow, endRow) {
         var outdent = true;
         var outentedRows = [];