Brandt Bucher <[email protected]> added the comment:
> Note that in your last message, `d1 |= cm2` will fail for this reason. You
> can of course fix that with `d1 |= dict(cm2)`, although IIUC there's no
> reason one of the maps couldn't be some other [Mutable]Mapping.
Mappings and iterables are fine for the in-place variant. :)
>>> from collections import ChainMap
>>> d = {}
>>> c = ChainMap({"r": 2, "d":2})
>>> d |= c
>>> d
{'r': 2, 'd': 2}
I think it would be confusing to have `ChainMap | ChainMap` behave subtly
different than `dict | ChainMap`. It would be *especially* odd if it also
differed subtly from `ChainMap | dict`.
To recap:
+1 on adding the operators with dict semantics,
+0 on no PEP 584 for ChainMap.
-0 on implementing them, but changing the winning behavior by concatenating the
maps lists or something. This would probably make more sense to me as a `+`
operator, honestly. :(
-1 for having the operators behave differently (other than performance
shortcuts) for `cm | d`, `cm | cm`, `cm |= d`, `cm |= cm`.
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<https://bugs.python.org/issue36144>
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