diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -886,7 +886,7 @@ class EditorWindow(object):
             with open(self.recent_files_path, 'w',
                         encoding='utf_8', errors='replace') as rf_file:
                 rf_file.writelines(rf_list)
-        except IOError as err:
+        except OSError as err:
             if not getattr(self.root, "recentfilelist_error_displayed", False):
                 self.root.recentfilelist_error_displayed = True
                 tkMessageBox.showerror(title='IDLE Error',
diff --git a/Lib/idlelib/GrepDialog.py b/Lib/idlelib/GrepDialog.py
--- a/Lib/idlelib/GrepDialog.py
+++ b/Lib/idlelib/GrepDialog.py
@@ -82,7 +82,7 @@ class GrepDialog(SearchDialogBase):
         for fn in list:
             try:
                 f = open(fn, errors='replace')
-            except IOError as msg:
+            except OSError as msg:
                 print(msg)
                 continue
             lineno = 0
diff --git a/Lib/idlelib/IOBinding.py b/Lib/idlelib/IOBinding.py
--- a/Lib/idlelib/IOBinding.py
+++ b/Lib/idlelib/IOBinding.py
@@ -212,7 +212,7 @@ class IOBinding:
             f.seek(0)
             bytes = f.read()
             f.close()
-        except IOError as msg:
+        except OSError as msg:
             tkMessageBox.showerror("I/O Error", str(msg), master=self.text)
             return False
         chars, converted = self._decode(two_lines, bytes)
@@ -377,7 +377,7 @@ class IOBinding:
             f.flush()
             f.close()
             return True
-        except IOError as msg:
+        except OSError as msg:
             tkMessageBox.showerror("I/O Error", str(msg),
                                    master=self.text)
             return False
diff --git a/Lib/idlelib/OutputWindow.py b/Lib/idlelib/OutputWindow.py
--- a/Lib/idlelib/OutputWindow.py
+++ b/Lib/idlelib/OutputWindow.py
@@ -106,7 +106,7 @@ class OutputWindow(EditorWindow):
                     f = open(filename, "r")
                     f.close()
                     break
-                except IOError:
+                except OSError:
                     continue
         else:
             return None
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -58,7 +58,7 @@ else:
         try:
             file.write(warnings.formatwarning(message, category, filename,
                                               lineno, line=line))
-        except IOError:
+        except OSError:
             pass  ## file (probably __stderr__) is invalid, warning dropped.
     warnings.showwarning = idle_showwarning
     def idle_formatwarning(message, category, filename, lineno, line=None):
@@ -211,7 +211,7 @@ class PyShellEditorWindow(EditorWindow):
         try:
             with open(self.breakpointPath, "r") as fp:
                 lines = fp.readlines()
-        except IOError:
+        except OSError:
             lines = []
         try:
             with open(self.breakpointPath, "w") as new_file:
@@ -222,7 +222,7 @@ class PyShellEditorWindow(EditorWindow):
                 breaks = self.breakpoints
                 if breaks:
                     new_file.write(filename + '=' + str(breaks) + '\n')
-        except IOError as err:
+        except OSError as err:
             if not getattr(self.root, "breakpoint_error_displayed", False):
                 self.root.breakpoint_error_displayed = True
                 tkMessageBox.showerror(title='IDLE Error',
@@ -528,7 +528,7 @@ class ModifiedInterpreter(InteractiveInt
             return
         try:
             response = clt.pollresponse(self.active_seq, wait=0.05)
-        except (EOFError, IOError, KeyboardInterrupt):
+        except (EOFError, OSError, KeyboardInterrupt):
             # lost connection or subprocess terminated itself, restart
             # [the KBI is from rpc.SocketIO.handle_EOF()]
             if self.tkconsole.closing:
diff --git a/Lib/idlelib/configHandler.py b/Lib/idlelib/configHandler.py
--- a/Lib/idlelib/configHandler.py
+++ b/Lib/idlelib/configHandler.py
@@ -142,7 +142,7 @@ class IdleUserConfParser(IdleConfParser)
             fname = self.file
             try:
                 cfgFile = open(fname, 'w')
-            except IOError:
+            except OSError:
                 os.unlink(fname)
                 cfgFile = open(fname, 'w')
             with cfgFile:
@@ -207,7 +207,7 @@ class IdleConf:
                         userDir+',\n but the path does not exist.\n')
                 try:
                     sys.stderr.write(warn)
-                except IOError:
+                except OSError:
                     pass
                 userDir = '~'
         if userDir == "~": # still no path to home!
@@ -217,7 +217,7 @@ class IdleConf:
         if not os.path.exists(userDir):
             try:
                 os.mkdir(userDir)
-            except (OSError, IOError):
+            except OSError:
                 warn = ('\n Warning: unable to create user config directory\n'+
                         userDir+'\n Check path and permissions.\n Exiting!\n\n')
                 sys.stderr.write(warn)
@@ -251,7 +251,7 @@ class IdleConf:
                                                      raw=raw)))
             try:
                 sys.stderr.write(warning)
-            except IOError:
+            except OSError:
                 pass
         try:
             if self.defaultCfg[configType].has_option(section,option):
@@ -268,7 +268,7 @@ class IdleConf:
                        (option, section, default))
             try:
                 sys.stderr.write(warning)
-            except IOError:
+            except OSError:
                 pass
         return default
 
@@ -380,7 +380,7 @@ class IdleConf:
                            (element, themeName, theme[element]))
                 try:
                     sys.stderr.write(warning)
-                except IOError:
+                except OSError:
                     pass
             colour=cfgParser.Get(themeName,element,default=theme[element])
             theme[element]=colour
@@ -637,7 +637,7 @@ class IdleConf:
                                (event, keySetName, keyBindings[event]))
                     try:
                         sys.stderr.write(warning)
-                    except IOError:
+                    except OSError:
                         pass
         return keyBindings
 
diff --git a/Lib/idlelib/rpc.py b/Lib/idlelib/rpc.py
--- a/Lib/idlelib/rpc.py
+++ b/Lib/idlelib/rpc.py
@@ -339,7 +339,7 @@ class SocketIO(object):
                 r, w, x = select.select([], [self.sock], [])
                 n = self.sock.send(s[:BUFSIZE])
             except (AttributeError, TypeError):
-                raise IOError("socket no longer exists")
+                raise OSError("socket no longer exists")
             except OSError:
                 raise
             else:
diff --git a/Lib/idlelib/textView.py b/Lib/idlelib/textView.py
--- a/Lib/idlelib/textView.py
+++ b/Lib/idlelib/textView.py
@@ -66,7 +66,7 @@ def view_file(parent, title, filename, e
     try:
         with open(filename, 'r', encoding=encoding) as file:
             contents = file.read()
-    except IOError:
+    except OSError:
         import tkinter.messagebox as tkMessageBox
         tkMessageBox.showerror(title='File Load Error',
                                message='Unable to load file %r .' % filename,