collections.OrderedDict is a subclass of dict that remembers in what order its entries were added. >>> import collections
>>> od = collections.OrderedDict( dict( one='x' , two='q' , three='s' ))
>>> od['four'] = 'a'
>>> od['five'] = 't'
>>> for k, v in od.items(): print(f'{k} = {v}')
...
one = x
two = q
three = s
four = a
five = t
>>>