Queue implementation uisng linked list in python3

	class Node:         def __init__(self, value = None, pointer = None):               self.value = value               self.pointer = pointer
	class LinkedQueue:
	def __init__(self):
	self.head = None
	self.tail = None
	def isEmpty(self):
	return not bool(self.head)
	def dequeue(self):
	if self.head:
	value = self.head.value
	self.head = self.head.pointer
	return value
	def enqueue(self, value):
	node = Node(value)
	if not self.head:
	self.head = node
	self.tail = node
	else:
	if self.tail:
	self.tail.pointer = node
	self.tail = node
	def size(self):
	node = self.head
	num_nodes = 0
	while node:
	num_nodes += 1
	node = node.pointer
	return num_nodes
	def peek(self):
	return self.head.value
	def _print(self):
	node = self.head
	while node:
	print(node.value,end=' ')
	node = node.pointer
	print()
	if __name__ == '__main__':
	queue = LinkedQueue()
	print("Is the queue empty? ", queue.isEmpty())
	print("Adding 1 to 10 in queue element ")
	for i in range(1,11):
	queue.enqueue(i)
	print("Queue size : ", queue.size())
	print("Queue front data : ", queue.peek())
	print("Remove queue front element :", queue.dequeue())
	print("Queue new front data : ", queue.peek())
	print("Is the queue empty? ", queue.isEmpty())
	print("Printing the queue element :",end=' ')
	queue._print()
	queue.enqueue(44)
	queue.enqueue(99)
	print("Printing the new queue element :",end=' ')
	queue._print()
	print("Queue size : ", queue.size())
	print("Queue front data : ", queue.peek())

Queue implement using two stack in python3

	Q.Implement queue using two Stack class Queue: def __init__(self):
	self.in_stack = []
	self.out_stack = []
	def enqueue(self, data):
	while self.out_stack:
	self.in_stack.append(self.out_stack.pop())
	self.in_stack.append(data)
	while self.in_stack:
	self.out_stack.append(self.in_stack.pop())
	def dequeue(self):
	if self.out_stack:
	self.out_stack.pop()
	def size(self):
	return len(self.out_stack)
	def frontData(self):
	if self.out_stack:
	return self.out_stack[-1]
	def __repr__(self):
	if self.out_stack:
	return '{}'.format(self.out_stack)
	def isEmpty(self):
	return not (bool(self.out_stack))
	if __name__ == '__main__':
	queue = Queue()
	print("Is the queue empty? ", queue.isEmpty())
	print("Adding 1 to 10 in queue element ")
	for i in range(1,11):
	queue.enqueue(i)
	print("Queue size : ", queue.size())
	print("Queue front data : ", queue.frontData())
	print("Remove queue front element ")
	queue.dequeue()
	print("Queue new front data : ", queue.frontData())
	print("Is the queue empty? ", queue.isEmpty())
	print("Printing the queue element : ")
	print(queue)
	queue.enqueue(44)
	queue.enqueue(99)
	print("Printing the new queue element : ")
	print(queue)
	print("Queue size : ", queue.size())
	print("Queue front data : ", queue.frontData())