ch12.py

c=Counter({'a':1,'b':2,'c':-5})
#list unique elements
print (list(c))#Output:['a', 'b', 'c']

#converts to set containing elements
print (set(c))#Output:{'c', 'a', 'b'}

#converts to a regular dictionary
print (dict(c))#Output:{'a': 1, 'b': 2, 'c': -5}

#convert to list of tuple.
print (c.items())#Output:dict_items([('a', 1), ('b', 2), ('c', -5)])

#Converting form list of tuples
c1=Counter([('a',1),('b',2)])
print (c1)#Output:Counter({('a', 1): 1, ('b', 2): 1})