class Deque(object): def __init__(self): self.items = [] def isEmpty(self): return self.items == [] def addFront(self, item): self.items.append(item) def addRear(self, item): self.items.insert(0, item) def removeFront(self): return self.items.pop() def removeRear(self): return self.items.pop(0) def size(self): return len(self.items)
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