o2.py

d1={'a':1,'b':2,'c':3}
#removes and returns the last inserted item in the dictionary
print (d1.popitem())#Output:('c', 3)

from collections import OrderedDict

d1=OrderedDict({'a':1,'b':2,'c':3})
# by default,removes and returns the last inserted item in the OrderedDict
print (d1.popitem())#Output:('c', 3)
#if last=False,removes and returns the first inserted item in the OrderedDict.
print (d1.popitem(last=False))#Output:('a', 1)