diff -r fcc8066cdc4d Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -621,14 +621,6 @@ class ModifiedInterpreter(InteractiveInt
         self.more = 0
         self.save_warnings_filters = warnings.filters[:]
         warnings.filterwarnings(action="error", category=SyntaxWarning)
-        if isinstance(source, types.UnicodeType):
-            from idlelib import IOBinding
-            try:
-                source = source.encode(IOBinding.encoding)
-            except UnicodeError:
-                self.tkconsole.resetoutput()
-                self.write("Unsupported characters in input\n")
-                return
         try:
             # InteractiveInterpreter.runsource() calls its runcode() method,
             # which is overridden (see below)