[Python-ideas] Backward-incompatible changes for Python 4

[Paul Moore]

On Mon, 1 Apr 2019 at 15:59, Todd <toddrjen at gmail.com> wrote:

> Currently there is no empty set literal.  This is a hold-over from when there were no sets.  Now would be a good opportunity to add one.  I suggest {} become an empty set and {:} be an empty dict.

There should be no need for two styles - now that Python has type
inference, it should be possible for users to just type {} and have
the interpreter work out which was intended from context. Any
ambiguity can easily be resolved by using a type hint.

Paul