Serhiy Storchaka added the comment:
Following code prints X([(1, 1), (3, 3)]) on 3.4 and X([(0, 0), (1, 1), (2, 2),
(3, 3), (4, 4)]) on 3.5+.
from collections import OrderedDict
class X(OrderedDict):
def __iter__(self):
for k in OrderedDict.__iter__(self):
if k % 2:
yield k
od = X((i, i) for i in range(5))
print(od.copy())
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