Your job is to implement the current OrderedDict. The recommended way to create it is to keep two synched lists. One containing the keys and the other the values. Example:

d = {
  'a': 1,
  'b': 2,
  'c': 3
}

keys = ['a', 'b', 'c']
values = [1, 2, 3]

The best way to iterate over these two collections is with the [zip](https://docs.python.org/3/library/functions.html#zip) function:

keys = ['a', 'b', 'c']
values = [1, 2, 3]

for k, v in zip(keys, values):
  print('{} => {}'.format(k, v))

Output:

a => 1
b => 2
c => 3

$ pip install -r requirements.txt

There's a script main.py created for debugging. Feel free to change it and experiment with it.

Tests in tests.py are written in order. You can use the -k flag to select them:

$ py.test tests.py -k test_set_new_items

Look for those tests marked with pytest.mark.skip.