Replace IOError with OSError (#16715)
diff --git a/Lib/io.py b/Lib/io.py
index bda4def..39878b8 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -4,7 +4,7 @@
At the top of the I/O hierarchy is the abstract base class IOBase. It
defines the basic interface to a stream. Note, however, that there is no
separation between reading and writing to streams; implementations are
-allowed to raise an IOError if they do not support a given operation.
+allowed to raise an OSError if they do not support a given operation.
Extending IOBase is RawIOBase which deals simply with the reading and
writing of raw bytes to a stream. FileIO subclasses RawIOBase to provide