diff -r 943d3e289ab4 Lib/tkinter/__init__.py
--- a/Lib/tkinter/__init__.py	Wed Oct 17 17:33:26 2012 +0300
+++ b/Lib/tkinter/__init__.py	Thu May 09 13:39:25 2013 -0300
@@ -2849,9 +2849,13 @@
         self.tk.call((self._w, 'set') + args)
 
 
+import itertools
 
 class Text(Widget, XView, YView):
     """Text widget which can display text in various forms."""
+
+    peer_count = itertools.count(1)
+
     def __init__(self, master=None, cnf={}, **kw):
         """Construct a text widget with the parent MASTER.
 
@@ -3075,13 +3079,18 @@
     def mark_previous(self, index):
         """Return the name of the previous mark before INDEX."""
         return self.tk.call(self._w, 'mark', 'previous', index) or None
-    def peer_create(self, newPathName, cnf={}, **kw): # new in Tk 8.5
-        """Creates a peer text widget with the given newPathName, and any
-        optional standard configuration options. By default the peer will
-        have the same start and and end line as the parent widget, but
-        these can be overriden with the standard configuration options."""
-        self.tk.call(self._w, 'peer', 'create', newPathName,
-            *self._options(cnf, kw))
+    def peer_create(self, newPathName=None, cnf={}, **kw): # new in Tk 8.5
+        """Creates a peer text widget and any optional standard
+        configuration options. By default the peer will have the same
+        start and and end line as the parent widget, but these can be
+        overriden with the standard configuration options."""
+        if newPathName is None:
+            basename = self.master._w if self.master._w != '.' else ''
+            newPathName = '%sp%d' % (basename, next(self.peer_count))
+        self.tk.call(self._w, 'peer', 'create', '.' + newPathName,
+                *self._options(cnf, kw))
+        peer = _textpeer(self.master, newPathName)
+        return peer
     def peer_names(self): # new in Tk 8.5
         """Returns a list of peers of this widget (this does not include
         the widget itself)."""
@@ -3213,6 +3222,11 @@
         """Obsolete function, use see."""
         self.tk.call((self._w, 'yview', '-pickplace') + what)
 
+class _textpeer(Text):
+    """Internal class used to represent a text peer."""
+    def __init__(self, master, name):
+        BaseWidget._setup(self, master, {'name': name})
+
 
 class _setit:
     """Internal class. It wraps the command in the widget OptionMenu."""