Pure Python strptime implementation by Brett Cannon.  See SF patch 474274.
diff --git a/Misc/ACKS b/Misc/ACKS
index 5aa7c9a..fa08b8a 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -74,6 +74,7 @@
 Lee Busby
 Ralph Butler
 Daniel Calvelo
+Brett Cannon
 Mike Carlton
 Luke Kenneth Casson Leighton
 Donn Cave