Brandt Bucher <[email protected]> added the comment:
As a somewhat simpler example:
>>> f = {False: False}
>>> z = {0: 0}
>>> f | z
{False: 0}
>>> {**f, **z}
{False: 0}
>>> f.update(z); f
{False: 0}
Though these hairier cases aren't explicitly addressed, the conflict behavior
is covered in the Rationale and Reference Implementation sections of the PEP.
All of the above examples share code (`dict_update_arg`), and that's definitely
intentional. I for one think it would be confusing (and probably a bug) if one
of the examples above gave a different key-value pair!
I find it makes more sense if you see a set as valueless keys (rather than
keyless values).
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<https://bugs.python.org/issue36144>
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