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@@ Line 1,994: / Line 1,994: @@
   return String.valueOf(rotated);
 }</lang>
+=={{header|Processing Python mode}}==
+When the user clicks on the (windowed) text, it should reverse its direction.
+<lang python>txt = "Hello, world! "
+dir = True
+def draw():
+    global txt
+    background(128)
+    text(txt, 10, height / 2)
+    if frameCount % 10 == 0:
+        if (dir):
+            txt = rotate(txt, 1)
+        else:
+            txt = rotate(txt, -1)
+        println(txt)
+def mouseReleased():
+    global dir
+    dir = not dir
+def rotate(text, startIdx):
+    rotated = text[startIdx:] + text[:startIdx]
+    return rotated
+</lang>
 =={{header|Prolog}}==