bpo-46522: fix concurrent.futures and io AttributeError messages (GH-30887)

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Andrew Svetlov <andrew.svetlov@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/Lib/io.py b/Lib/io.py
index 2a6140c..a205e00 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -70,7 +70,7 @@ def __getattr__(name):
         global OpenWrapper
         OpenWrapper = open
         return OpenWrapper
-    raise AttributeError(name)
+    raise AttributeError("module {__name__!r} has no attribute {name!r}")
 
 
 # Pretend this exception was created here.