Index: Lib/idlelib/PyShell.py
===================================================================
--- Lib/idlelib/PyShell.py	(revision 74276)
+++ Lib/idlelib/PyShell.py	(working copy)
@@ -840,6 +840,7 @@
         #
         text = self.text
         text.configure(wrap="char")
+        text.bind("<<paste>>", self.paste_callback)
         text.bind("<<newline-and-indent>>", self.enter_callback)
         text.bind("<<plain-newline-and-indent>>", self.linefeed_callback)
         text.bind("<<interrupt-execution>>", self.cancel_callback)
@@ -1032,6 +1033,39 @@
     def isatty(self):
         return True
 
+    def paste_callback(self, event):
+        text = self.text
+        tk = text.tk
+
+        try:
+            selection = tk.call('::tk::GetSelection', text, 'CLIPBOARD')
+        except TclError:
+            # No selection, probably.
+            return "break"
+        oldseparator = text.cget('autoseparators')
+        if oldseparator:
+            text.configure(autoseparators=0)
+            text.edit_separator()
+        if tk.call('tk', 'windowingsystem') != 'x11':
+            try:
+                text.delete('sel.first', 'sel.last')
+            except TclError:
+                # Nothing tagged with 'sel', probably.
+                pass
+        selection = selection.split('\n')[::-1]
+        while selection:
+            line = selection.pop()
+            if line == '':
+                text.event_generate('<<newline-and-indent>>')
+            else:
+                text.insert('insert', line)
+
+        if oldseparator:
+            text.edit_separator()
+            text.configure(autoseparators=1)
+
+        return "break"
+
     def cancel_callback(self, event=None):
         try:
             if self.text.compare("sel.first", "!=", "sel.last"):