queue.py

class Queue:
 def __init__(self):
 self.arr = []

 def isEmpty(self):
 return len(self.arr) == 0

 def enQueue(self, element):
 self.arr.append(element)

 def deQueue(self):
 del self.arr[0]

 def front(self):
 return self.arr[0]

 def last(self):
 return self.arr[len(self.arr) - 1]

 def printAll(self):
 print(self.arr)

 def size(self):
 return len(self.arr)

 def clear(self):
 return self.arr.clear()


queue_instance = Queue()
print(queue_instance.isEmpty())
queue_instance.enQueue('a')
queue_instance.enQueue('b')
queue_instance.enQueue('c')
queue_instance.enQueue('d')
queue_instance.deQueue()
queue_instance.deQueue()
queue_instance.printAll()
print(queue_instance.size())