Queue

class Queue:
  def __init__(self,size = 100):
  #@param size: int
    self.queue = []
    self.size = size

  def In(self,element):
  #@param element: qualsiasi tipo
    if len(self.queue) <= self.size:
      self.queue.append(element)
    else:
      print('Raggiunto limite di memoria')

  def Out(self):
    self.queue = self.queue[1:]

  def first(self):
  #@return: qualsiasi tipo
    return self.queue[0]

  def last(self):
  #@return: qualsiasi tipo
    return self.queue[-1]

  def empty(self):
  #@return: bool
    return not self.queue