from collections import OrderedDict od = OrderedDict() od['a'] = 1 od['b'] = 2 od['c'] = 3 print(od) # OrderedDict([('a', 1), ('b', 2), ('c', 3)]) od.move_to_end('a') print(od) # OrderedDict([('b', 2), ('c', 3), ('a', 1)])The above code creates an OrderedDict and adds three key-value pairs to it. It then prints out the OrderedDict, showing that the items are in the order in which they were added. The code then moves the 'a' key to the end of the OrderedDict and prints it out again to show that the order has been updated. Package Library: The `OrderedDict` is a built-in module of the python `collections` package. So, we don't need to install any external library to use this data structure in our python programs.