[3.13] gh-78889: Stop IDLE Shell freezes from sys.stdout.shell.xyz (GH-121876) #121911
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Problem occurred when attribute xyz could not be pickled.
Since this is not trivial to selectively fix, block all
attributes (other than 'width'). IDLE does not access them
and they are private implementation details.
(cherry picked from commit 58753f3)
Co-authored-by: Terry Jan Reedy tjreedy@udel.edu