Terry J. Reedy <tjre...@udel.edu> added the comment:

(IDLE does not support typing.Protocol classes, because no one has proposed 
that it do so, let alone submit a patch.)

A new keyword requires a PEP that specifies the syntax for an 'interface' 
statement and what such a statement would do.  You should start with discussion 
on the python-ideas list.  This should probably be closed until there is a 
concrete proposal that could be evaluated and possibly implemented or rejected.

----------
nosy: +terry.reedy

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