Author terry.reedy
Recipients docs@python, gvanrossum, kj, levkivskyi, terry.reedy
Date 2020-10-16.21:12:25
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Subscription of list and dict (only with '') and ??? is at least puzzling.  Removal of a new feature after release is a bad idea.  But this new feature, expansion of subscription, needs to documented in
https://docs.python.org/3/reference/expressions.html#subscriptions
as legal code.

The current first line

 "A subscription selects an item of a sequence (string, tuple or list) or mapping (dictionary) object:"

is no longer always true.  This suggested replacement is:

 "Subscription of a sequence (string, tuple or list) or mapping (dictionary) object selects an item from the collection."

Then at the end, add something like

 "Subscription of certain type objects creates a Generic Alias.

where 'Generic Alias links to where such are documented.
History
Date User Action Args
2020-10-16 21:12:25terry.reedysetrecipients: + terry.reedy, gvanrossum, docs@python, levkivskyi, kj
2020-10-16 21:12:25terry.reedysetmessageid: <1602882745.51.0.0345182836933.issue42010@roundup.psfhosted.org>
2020-10-16 21:12:25terry.reedylinkissue42010 messages
2020-10-16 21:12:25terry.reedycreate