Implement the Queue data structure using two Stacks

queue.py

class Queue():
  def __init__(self):
    self.inbox = []
    self.outbox = []
    
  def enqueue(self, item):
    self.inbox.append(item)
    
  def dequeue(self):
    if not self.outbox:
      while self.inbox:
        self.outbox.append(self.inbox.pop())
        
    try:
      return self.outbox.pop()
    except IndexError:
      return