In August 2020, in the context of PEP 472 I suggested
>>> {-}
for the empty set literal. At present the closest we can do for an empty
set literal is
>>> {0} - {0}
set()
The context for this is whether PEP 472 should make
>>> something[]
a syntax error. If we do then, what about the workarounds
>>> something[*argv]
>>> something[**kwargs]
which so to speak convert the syntax error to a run-time error.
Because
>>> something[]
was ugly and easily misunderstood I suggested
>>> something[-]
and hence
>>> {-}
as new syntax.
The thread from August 2020 can be found (with >>> prompts as quotes) at
https://mail.python.org/archives/list/python-ideas@python.org/thread/2QANGFBMGUSCYOLU3GJ6AOGV6Q2ATC72/#QOBONXUPUMC3ULCGJU6FVHOCIZQDT45W
--
Jonathan
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