def edit(self, code, year, value):
      global firstYear
      currentNode = self.head
      previous = None
      found = False
      while not found:
         if currentNode.data[1] == code or currentNode.data[0] == name:
            found = True
            indice = (int(year) - firstYear) + 2
            currentNode.data[indice] = value
         else:
            previous = currentNode
            currentNode = currentNode.get_next()