Replace IOError with OSError (#16715)
diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 490eb21..81fcfd9 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -223,7 +223,7 @@
     if lastupdate is None or lastupdate < mtime:
         try:
             file = tokenize.open(filename)
-        except IOError:
+        except OSError:
             # module can't be opened, so skip it
             return None
         binary_suffixes = importlib.machinery.BYTECODE_SUFFIXES[:]
@@ -1419,7 +1419,7 @@
     try:
         pipe.write(text)
         pipe.close()
-    except IOError:
+    except OSError:
         pass # Ignore broken pipes caused by quitting the pager program.
 
 def tempfilepager(text, cmd):