🔒 Circular queues

[sullen lichen]

I get the concept of circular queues but it partially works when I tried to make it in Python.

[ancient pewter]

@sullen lichen

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[sullen lichen]

not sure how to make it colour coded

[solemn cipher]

!code

[ancient pewter]

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[sullen lichen]

#############################################################################
# Queue class implemented with an array
class Queue:
    # Constructor
    def __init__(self):
        self.FrontPointer = 0
        self.BackPointer = -1
        self.Max = 5
        self.Count = 0
        self.Contents = ["" for Elements in range(self.Max)]

    # Add an item to the queue
    def Enqueue(self, Item):

        # ENTER YOUR CODE HERE
        if self.Count < self.Max - 1:
          self.BackPointer = (self.BackPointer + 1) % self.Max
          self.Contents[self.BackPointer] = Item
          self.Count = self.Count + 1
          self.print_queue()
          return True
        else:
          return False

    # Remove an item from the queue
    def Dequeue(self):

        # ENTER YOUR CODE HERE
        if self.Count > 0:
          Item = self.Contents[self.FrontPointer]
          self.FrontPointer = (self.FrontPointer + 1) % self.Max
          self.Count = self.Count - 1
          self.print_queue()
          return Item
        else:
          return None


    # Look at the next item in the queue without removing it
    def Peek(self):

        # ENTER YOUR CODE HERE
        if self.FrontPointer <= self.BackPointer:
          Item = self.Contents[self.FrontPointer]
          return Item
        else:
          return None
    def print_queue(self):
        print("Queue:", self.Contents[self.FrontPointer:self.FrontPointer + self.Count])


#############################################################################
# Main program starts here

# Subroutine to output the contents of a queue
def ClearQueue(InputQueue):
    Item = InputQueue.Peek()
    while Item:
        Item = InputQueue.Dequeue()
        if Item:
            print(Item)

# How to create a new queue (you can have as many queue objects as you want using lists)
MyQueue = Queue()

#How to add to the queue (returns True on success or False on queue overflow)
Action = MyQueue.Enqueue("Craig")
Action = MyQueue.Enqueue("Dave")
Action = MyQueue.Enqueue("Mark")
Action = MyQueue.Enqueue("Sam")
print(MyQueue.Dequeue())
print(MyQueue.Dequeue())
Action = MyQueue.Enqueue("Andy")
Action = MyQueue.Enqueue("Carol")
print(MyQueue.Dequeue())
print(MyQueue.Dequeue())
print(MyQueue.Dequeue())

# How to remove from the queue (queue underflow returns None)
#print(MyQueue.Dequeue())

# Output the entire stack using the ClearQueue subroutine
#ClearQueue(MyQueue)
print(MyQueue.Peek())

[sullen lichen]

these are the operations (not organised)

by using the self.print_queue() method i can have a look at my queue and it works fine, however i do not get the expected output

[ancient pewter]

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