# Author: Huahua
class MyListIterator:
  def __init__(self, my_list, index=0):
    self.my_list = my_list
    self.index = index

  def __next__(self):
    if self.index < len(self.my_list.data):
      val = self.my_list.data[self.index]
      self.index += 1
      return val
    else:
      raise StopIteration()

  def __iter__(self):
    return MyListIterator(self.my_list, self.index)
    # return self

class MyList:
  def __init__(self, data):
    self.data = list(data)

  def __getitem__(self, index):
    return self.data[index]

  def __len__(self):
    return len(self.data)

  def __iter__(self):
    return MyListIterator(self)

my_list = MyList([1,2,3,4,5])
it = iter(my_list)
next(it)
it2 = iter(it)
next(it)
print('--- it ---')
for x in it:
  print(x) # 3, 4, 5
print('--- it2 ---')
for x in it2:
  print(x) # 2, 3, 4, 5