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    This does not answer the question. The question clearly asks for a new dictionary, z, from original dictionaries, x and y, with values from y replacing those of x - not an updated dictionary. This answer modifies y in-place by adding values from x. Worse, it does not copy these values, so one could further modify the modified dictionary, y, and modifications could be reflected in dictionary x. @Jérôme I hope this code is not causing any bugs for your application - at least consider using deepcopy to copy the values.
    – Aaron Hall ♦
    Commented Nov 9, 2018 at 2:14
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    @AaronHall agreed this does not answer the question. But it answers my need. I understand those limitations, but that's not an issue in my case. Thinking of it, maybe the name is misleading, as it might evoke a deepcopy, which it does not provide. But it addresses deep nesting. Here's another implementation from the Martellibot: stackoverflow.com/questions/3232943/….
    – Jérôme
    Commented Nov 9, 2018 at 13:24
  • In python 3.8.2 it gives me AttributeError: 'dict' object has no attribute 'iteritems' so I have changes the iteritems with items.
    – thanos.a
    Commented Mar 3 at 17:18