[issue36144] Dictionary union. (PEP 584)

[Brandt Bucher]

Brandt Bucher <brandtbucher at gmail.com> added the comment:

The plan is to follow dict’s semantics. The |= operator will basically delegate to the first map in the chain. The | operator will create a new ChainMap where the first map is the merged result of the old first map, and the others are the same.

So, basically update / copy-and-update, respectively.

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<https://bugs.python.org/issue36144>
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