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In [1]:

    
from collections import deque



In [2]:

    
d = deque(['a', 'b', 'c'])
print(d)









    



deque(['a', 'b', 'c'])



In [3]:

    
d.append('d')
print(d)









    



deque(['a', 'b', 'c', 'd'])



In [4]:

    
print(d.popleft())



In [5]:

    
print(d)









    



deque(['b', 'c', 'd'])