diff -r cf70f030a744 Lib/idlelib/EditorWindow.py
--- a/Lib/idlelib/EditorWindow.py	Wed Jun 18 23:07:46 2014 -0400
+++ b/Lib/idlelib/EditorWindow.py	Mon Jun 23 22:02:58 2014 +0300
@@ -394,6 +394,12 @@
                     # byte-to-byte conversion
                     return filename.decode('iso8859-1')
 
+    try:
+        unicode
+    except NameError:   # no unicode support
+        def _filename_to_unicode(self, filename):
+            return filename
+
     def new_callback(self, event):
         dirname, basename = self.io.defaultfilename()
         self.flist.new(dirname)
diff -r cf70f030a744 Lib/idlelib/IOBinding.py
--- a/Lib/idlelib/IOBinding.py	Wed Jun 18 23:07:46 2014 -0400
+++ b/Lib/idlelib/IOBinding.py	Mon Jun 23 22:02:58 2014 +0300
@@ -20,6 +20,14 @@
 from idlelib.configHandler import idleConf
 
 try:
+    _unicode = unicode
+except NameError:
+    # If Python is built without Unicode support, the unicode type
+    # will not exist. Fake one.
+    class _unicode(object):
+        pass
+
+try:
     from codecs import BOM_UTF8
 except ImportError:
     # only available since Python 2.3
@@ -34,7 +42,10 @@
     pass
 
 # Encoding for file names
-filesystemencoding = sys.getfilesystemencoding()
+try:
+    filesystemencoding = sys.getfilesystemencoding()
+except AttributeError:  # no unicode support
+    filesystemencoding = None
 
 encoding = "ascii"
 if sys.platform == 'win32':
@@ -66,7 +77,7 @@
                 # situation occurs on Mac OS X
                 encoding = 'ascii'
             codecs.lookup(encoding)
-        except (ValueError, LookupError):
+        except (ValueError, LookupError, AttributeError):
             pass
 
 encoding = encoding.lower()
@@ -260,7 +271,7 @@
         firsteol = self.eol_re.search(chars)
         if firsteol:
             self.eol_convention = firsteol.group(0)
-            if isinstance(self.eol_convention, unicode):
+            if isinstance(self.eol_convention, _unicode):
                 # Make sure it is an ASCII string
                 self.eol_convention = self.eol_convention.encode("ascii")
             chars = self.eol_re.sub(r"\n", chars)
@@ -320,6 +331,12 @@
             pass
         return chars
 
+    try:
+        unicode
+    except NameError:
+        def decode(self, chars):
+            return chars
+
     def maybesave(self):
         if self.get_saved():
             return "yes"
@@ -535,7 +552,7 @@
             self.opendialog = tkFileDialog.Open(master=self.text,
                                                 filetypes=self.filetypes)
         filename = self.opendialog.show(initialdir=dir, initialfile=base)
-        if isinstance(filename, unicode):
+        if isinstance(filename, _unicode):
             filename = filename.encode(filesystemencoding)
         return filename
 
@@ -557,7 +574,7 @@
             self.savedialog = tkFileDialog.SaveAs(master=self.text,
                                                   filetypes=self.filetypes)
         filename = self.savedialog.show(initialdir=dir, initialfile=base)
-        if isinstance(filename, unicode):
+        if isinstance(filename, _unicode):
             filename = filename.encode(filesystemencoding)
         return filename
 
diff -r cf70f030a744 Lib/idlelib/OutputWindow.py
--- a/Lib/idlelib/OutputWindow.py	Wed Jun 18 23:07:46 2014 -0400
+++ b/Lib/idlelib/OutputWindow.py	Mon Jun 23 22:02:58 2014 +0300
@@ -40,7 +40,7 @@
         if isinstance(s, str):
             try:
                 s = unicode(s, IOBinding.encoding)
-            except UnicodeError:
+            except UnicodeError, NameError:
                 # some other encoding; let Tcl deal with it
                 pass
         self.text.insert(mark, s, tags)
diff -r cf70f030a744 Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py	Wed Jun 18 23:07:46 2014 -0400
+++ b/Lib/idlelib/PyShell.py	Mon Jun 23 22:02:58 2014 +0300
@@ -37,6 +37,14 @@
 from idlelib import RemoteDebugger
 from idlelib import macosxSupport
 
+try:
+    _unicode = unicode
+except NameError:
+    # If Python is built without Unicode support, the unicode type
+    # will not exist. Fake one.
+    class _unicode(object):
+        pass
+
 IDENTCHARS = string.ascii_letters + string.digits + "_"
 HOST = '127.0.0.1' # python execution server on localhost loopback
 PORT = 0  # someday pass in host, port for remote debug capability
@@ -1074,7 +1082,7 @@
         line = self.text.get("iomark", "end-1c")
         if len(line) == 0:  # may be EOF if we quit our mainloop with Ctrl-C
             line = "\n"
-        if isinstance(line, unicode):
+        if isinstance(line, _unicode):
             from idlelib import IOBinding
             try:
                 line = line.encode(IOBinding.encoding)
@@ -1310,7 +1318,12 @@
             return 'disabled'
         return super(PyShell, self).rmenu_check_paste()
 
-class PseudoFile(io.TextIOBase):
+try:
+    _TextIOBase = io.TextIOBase
+except AttributeError:
+    _TextIOBase = io.RawIOBase
+
+class PseudoFile(_TextIOBase):
 
     def __init__(self, shell, tags, encoding=None):
         self.shell = shell
@@ -1338,9 +1351,9 @@
     def write(self, s):
         if self.closed:
             raise ValueError("write to closed file")
-        if type(s) not in (unicode, str, bytearray):
+        if type(s) not in (_unicode, str, bytearray):
             # See issue #19481
-            if isinstance(s, unicode):
+            if isinstance(s, _unicode):
                 s = unicode.__getslice__(s, None, None)
             elif isinstance(s, str):
                 s = str.__str__(s)