old_contents: from .. import idx
  import os
  
  def test__count_dimensions():
      yield check__count_dimensions, 9, 0
      yield check__count_dimensions, [1, 2], 1
      yield check__count_dimensions, [[1, 2], [3, 6, 2]], 2
      yield check__count_dimensions, [[[1,2], [2]]], 3
  
  def check__count_dimensions(lst, i):
      assert idx._count_dimensions(lst) == i
  
  # these two are equivalent according to the format on http://yann.lecun.com/exdb/mnist/
  _somelist = [[1, 2], [3, 4]]
  _somebytes = b'\x00\x00\x0C\x02' + b'\x01\x02\x03\x04'
  
  def test_list_to_idx():
      data = idx.list_to_idx(_somelist, 'i')
      assert data == _somebytes
  
  def test_idx_to_list():
      lst = idx.idx_to_list(_somebytes)
      assert lst == _somelist
  
new_contents: from .. import idx
  import os
  
  def test__count_dimensions():
      yield check__count_dimensions, 9, 0
      yield check__count_dimensions, [1, 2], 1
      yield check__count_dimensions, [[1, 2], [3, 6, 2]], 2
      yield check__count_dimensions, [[[1,2], [2]]], 3
  
  def check__count_dimensions(lst, i):
      assert idx._count_dimensions(lst) == i
  
  # these two are equivalent according to the format on http://yann.lecun.com/exdb/mnist/
  _somelist = [[1, 2], [3, 4]]
  def _get_somebytes():
      header = b'\x00\x00\x0C\x02'
      dimensionsizes = b'\x00\x00\x00\x02' + b'\x00\x00\x00\x02'
      data = b'\x00\x00\x00\x01' + b'\x00\x00\x00\x02'
      data += b'\x00\x00\x00\x03' + b'\x00\x00\x00\x04'
      return header + dimensionsizes + data
  _somebytes = _get_somebytes()
  
  def test_list_to_idx():
      data = idx.list_to_idx(_somelist, 'i')
      print(data, _somebytes)
      assert data == _somebytes
  
  def test_idx_to_list():
      lst = idx.idx_to_list(_somebytes)
      assert lst == _somelist
  
subject: Fix issue where idx test uses wrong bytes object