Mailman 3 Add a __valid_getitem_requests__ protocol - Python-ideas

18 Feb 2020

      It'd be nice to have a __valid_getitem_requests__ protocol that, if 
present, yields pairs such that:

for key, value in items(obj):
   assert obj[key] == value

for any obj. Note that this definition explicitly allows subsets, which 
makes it useful for sequences and defaultdicts, as they can have all 
sorts of keys (or even infinitely many in the case of defaultdict):
...
...
...
[1, 2, 3, 4, 5][1]
2
[1, 2, 3, 4, 5][1:3]
[2, 3]
[1, 2, 3, 4, 5][-1]
5
and as such we should consider limiting the results for at least these 2 
cases.

I currently use a similar idea in my code but I feel like having this 
would make my code more extensible without ppl having to monkeypatch it.

Add a __valid_getitem_requests__ protocol

Soni L.

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