Replace IOError with OSError (#16715)
diff --git a/Lib/quopri.py b/Lib/quopri.py
index 3d0f0ac..e5bd010 100755
--- a/Lib/quopri.py
+++ b/Lib/quopri.py
@@ -223,7 +223,7 @@
         else:
             try:
                 fp = open(file, "rb")
-            except IOError as msg:
+            except OSError as msg:
                 sys.stderr.write("%s: can't open (%s)\n" % (file, msg))
                 sts = 1
                 continue