>>> fromcollectionsimportdeque>>> queue=deque(["Eric","John","Michael"])>>> queue.append("Terry")# Terry arrives>>> queue.append("Graham")# Graham arrives>>> queue.popleft()# The first to arrive now leaves'Eric'>>> queue.popleft()# The second to arrive now leaves'John'>>> queue# Remaining queue in order of arrivaldeque(['Michael', 'Terry', 'Graham'])