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>

Author: 3 people

Lib/_pyio.py

@@ -312,7 +312,7 @@ def __getattr__(name):
         global OpenWrapper
         OpenWrapper = open
         return OpenWrapper
-    raise AttributeError(name)
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")
 
 
 # In normal operation, both `UnsupportedOperation`s should be bound to the

Lib/concurrent/futures/__init__.py

@@ -50,4 +50,4 @@ def __getattr__(name):
         ThreadPoolExecutor = te
         return te
 
-    raise AttributeError(f"module {__name__} has no attribute {name}")
+    raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

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.

Misc/NEWS.d/next/Library/2022-01-25-15-31-04.bpo-46522.tYAlX4.rst

@@ -0,0 +1 @@
+Make various module ``__getattr__`` AttributeErrors more closely match a typical AttributeError