python: queue

class queue():
    def __init__(self, size=10):
        self.size = size
        self.array = [None for _ in range(self.size)]
        self.front = -1
        self.rear = -1
        
    def isFull(self):
        if self.rear >= self.size -1  and self.front == 0:
            return True
        return False
    
    def isEmpty(self):
        if self.front <= -1:
            return True
        return False
    
    def enQueue(self, element):
        if self.isFull():
            raise Exception("Queue out of range")
        if self.front == -1:
            self.front = 0
        self.rear += 1
        self.array[self.rear] = element

        
    def deQueue(self):
        if self.isEmpty():
            raise Exception("Queue out of range")
        data = self.array[self.front]
        if self.front  >= self.rear:
            print("reset")
            self.front = -1
            self.rear = -1
        else:
            self.front += 1    
        return data
        
    
    def display(self):
        print([None for _ in range(0,self.front)] + self.array[self.front:self.rear+1] + [None for _ in range(self.rear+1, self.size)])