Sorting a list of tuples by the last last elements of the tuple

howtos_as_py_files/sort_list_of_tuples_by_ele.py

@@ -1,6 +1,15 @@
 # Sebastian Raschka 09/02/2014
 # Sorting a list of tuples by the last last elements of the tuple
 
+
+# Here, we make use of the "key" parameter of the in-built "sorted()" function 
+# (also available for the ".sort()" method), which let's us define a function 
+# that is called on every element that is to be sorted. In this case, our 
+# "key"-function is a simple lambda function that returns the last item 
+# from every tuple.
+
+
+
 a_list = [(1,3,'c'), (2,3,'a'), (1,2,'b')]
 
 sorted_list = sorted(a_list, key=lambda e: e[::-1])