Replace IOError with OSError (#16715)
diff --git a/Lib/urllib/error.py b/Lib/urllib/error.py
index 237ed6b..45b7169 100644
--- a/Lib/urllib/error.py
+++ b/Lib/urllib/error.py
@@ -1,6 +1,6 @@
"""Exception classes raised by urllib.
-The base exception class is URLError, which inherits from IOError. It
+The base exception class is URLError, which inherits from OSError. It
doesn't define any behavior of its own, but is the base class for all
exceptions defined in this package.
@@ -17,11 +17,11 @@
# do these error classes make sense?
-# make sure all of the IOError stuff is overridden. we just want to be
+# make sure all of the OSError stuff is overridden. we just want to be
# subtypes.
-class URLError(IOError):
- # URLError is a sub-type of IOError, but it doesn't share any of
+class URLError(OSError):
+ # URLError is a sub-type of OSError, but it doesn't share any of
# the implementation. need to override __init__ and __str__.
# It sets self.args for compatibility with other EnvironmentError
# subclasses, but args doesn't have the typical format with errno in