Added cartesian program

cartesian.py

@@ -0,0 +1,21 @@
+def cart(li):
+
+    #In case an empty list is provided
+    #Ex : cart([])
+
+    if len(li) == 0:
+        return [()]
+    stack = []
+    if len(li) == 1:
+        return [[each] for each in li[0]]
+    else:
+        for each in li[0]:
+            results = cart(li[1:])
+            for each_result in results:
+                each_result.insert(0, each)
+                stack.append(each_result)
+        return stack
+
+result = cart([['title1', 'title2'], ['body1', 'body2', 'body3'], ['url1', 'url2', 'url3']])
+for combination in result:
+    print combination