bpo-29957: change LBYL key lookup to dict.setdefault (#938)
* change LBYL key lookup to dict.setdefault
The ``results`` was constructed as a defaultdict and we could simply
delete the check ``if key not in results``. However, I think it's safer
to use dict.setdefault as I'm not sure whether the caller expects a
regular dict or defaultdict.
* add name to the acknowledgements file
* use defaultdict to make the key-lookup cleaner
diff --git a/Misc/ACKS b/Misc/ACKS
index 2164206..379ffc5 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
Binary files differ