Merge Py Idle changes:

Rev 1.35 fdrake
Use string.ascii_letters instead of string.letters (SF bug #226706).
Move computation of sets of characters out of the body of the function
that uses them.

Rev 1.36 tim_one
Convert a pile of obvious "yes/no" functions to return bool

Rev 1.37
(skip, done differently in Idlefork)

Rev 1.38 loewis
Patch #590913: PEP 263 support.

Rev 1.39 loewis
Convert characters from the locale's encoding on output.
Reject characters outside the locale's encoding on input.

Rev 1.40 doerwalter
(string methods)

Rev 1.41
(skipped, done by GvR in rpc)
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index 9c3aa50..7ce5244 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -289,6 +289,14 @@
         self.more = 0
         self.save_warnings_filters = warnings.filters[:]
         warnings.filterwarnings(action="error", category=SyntaxWarning)
+        if isinstance(source, types.UnicodeType):
+            import IOBinding
+            try:
+                source = source.encode(IOBinding.encoding)
+            except UnicodeError:
+                self.tkconsole.resetoutput()
+                self.write("Unsupported characters in input")
+                return
         try:
             return InteractiveInterpreter.runsource(self, source, filename)
         finally:
@@ -300,10 +308,12 @@
         "Stuff source in the filename cache"
         filename = "<pyshell#%d>" % self.gid
         self.gid = self.gid + 1
-        lines = string.split(source, "\n")
+        lines = source.split("\n")
         linecache.cache[filename] = len(source)+1, 0, lines, filename
         return filename
-
+    
+    IDENTCHARS = string.ascii_letters + string.digits + "_"
+    
     def showsyntaxerror(self, filename=None):
         """Extend base class method: Add Colorizing
 
@@ -326,7 +336,7 @@
         text.tag_add("ERROR", pos)
         text.see(pos)
         char = text.get(pos)
-        if char and char in string.letters + string.digits + "_":
+        if char and char in IDENTCHARS:
             text.tag_add("ERROR", pos + " wordstart", pos)
         self.tkconsole.resetoutput()
         self.write("SyntaxError: %s\n" % str(msg))
@@ -598,7 +608,7 @@
 
     def ispythonsource(self, filename):
         "Override EditorWindow method: never remove the colorizer"
-        return 1
+        return True
 
     def short_title(self):
         return self.shell_title
@@ -641,7 +651,7 @@
         return line
 
     def isatty(self):
-        return 1
+        return True
 
     def cancel_callback(self, event):
         try:
@@ -735,7 +745,7 @@
         # If we're in the current input and there's only whitespace
         # beyond the cursor, erase that whitespace first
         s = self.text.get("insert", "end-1c")
-        if s and not string.strip(s):
+        if s and not s.strip():
             self.text.delete("insert", "end-1c")
         # If we're in the current input before its last line,
         # insert a newline right at the insert point
@@ -852,7 +862,7 @@
         pass
 
     def isatty(self):
-        return 1
+        return True
 
 
 usage_msg = """\