bpo-43399: Fix ElementTree.extend not working on iterators (GH-24751)

diff --git a/Misc/ACKS b/Misc/ACKS
index 5d3f75a..42f0efd 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -1381,6 +1381,7 @@
 Davin Potts
 Guillaume Pratte
 Florian Preinstorfer
+Alex Prengère
 Amrit Prem
 Paul Prescod
 Donovan Preston
diff --git a/Misc/NEWS.d/next/Library/2021-03-04-17-53-46.bpo-43399.Wn95u-.rst b/Misc/NEWS.d/next/Library/2021-03-04-17-53-46.bpo-43399.Wn95u-.rst
new file mode 100644
index 0000000..0b8dffb
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-03-04-17-53-46.bpo-43399.Wn95u-.rst
@@ -0,0 +1,2 @@
+Fix ``ElementTree.extend`` not working on iterators when using the
+Python implementation