import operator  
d = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}  
print('Original dictionary : ',d)  
sorted_d = sorted(d.items(), key=operator.itemgetter(0))  
print('Dictionary in ascending order by value : ',sorted_d)  
sorted_d = sorted(d.items(), key=operator.itemgetter(0),reverse=True)  
print('Dictionary in descending order by value : ',sorted_d)  