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File Name: queue_list.py 

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from stylepy import h1,h2,h3,h4,h5,h6
class Queue:
    def __init__(self):
      self.items = []

    def enqueue(self, item):
      """Add an item to the end of the queue."""
      self.items.append(item)

    def dequeue(self):
      """Remove and return the first item from the queue."""
      if not self.is_empty():
        return self.items.pop(0)
      else:
        h4("Queue is empty")
        return None

    def is_empty(self):
      """Check if the queue is empty."""
      return len(self.items) == 0

    def size(self):
      """Return the number of items in the queue."""
      return len(self.items)

    def peek(self):
      """Return the first item in the queue without removing it."""
      if not self.is_empty():
        return self.items[0]
      else:
        h4("Queue is empty")
        return None

# Example usage:
if __name__ == "__main__":
  grocery_queue = Queue()
  h4("Initial queue:", grocery_queue.items)

  # Adding people to the queue
  grocery_queue.enqueue("Venkat")
  grocery_queue.enqueue("Suba")
  grocery_queue.enqueue("Gutti")
  h4("Queue after adding people:", grocery_queue.items)

  # Serving people from the queue
  serving_person = grocery_queue.dequeue()
  h4("Serving:", serving_person)
  h4("Queue after serving:", grocery_queue.items)

  # Checking the next person to be served
  next_person = grocery_queue.peek()
  h4("Next person to be served:", next_person)

Documentation

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  self.items.append(item)

def dequeue(self):
  if not self.is_empty():
    return self.items.pop(0)
  else:
    h4("Queue is empty")
    return None

def is_empty(self):
  return len(self.items) == 0

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

def peek(self):
  if not self.is_empty():
    return self.items[0]
  else:
    h4("Queue is empty")
    return None

Example usage:

if name == "main": grocery_queue = Queue() h4("Initial queue:", grocery_queue.items)

# Adding people to the queue grocery_queue.enqueue("Venkat") grocery_queue.enqueue("Suba") grocery_queue.enqueue("Gutti") h4("Queue after adding people:", grocery_queue.items)

# Serving people from the queue serving_person = grocery_queue.dequeue() h4("Serving:", serving_person) h4("Queue after serving:", grocery_queue.items)

# Checking the next person to be served next_person = grocery_queue.peek() h4("Next person to be served:", next_person)