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  1. # Se encola un nuevo elemento.
  2.     def enqueue(self, value):
  3.         new_node = Queue._Node(value, None)
  4.         if self.is_empty():
  5.             self._front = self._back = new_node
  6.         else:
  7.             self._back.next = self._back = new_node
  8.  
  9.     # Se desencola un elemento.
  10.     def dequeue(self):
  11.         assert not self.is_empty(), 'No se puede hacer dequeue de una cola vacia.'
  12.         value, self._front = self._front
  13.         if self._front is None:
  14.             self._back = None
  15.         return value
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