python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/tkinter/commondialog.py

@@ -0,0 +1,55 @@
+# base class for tk common dialogues
+#
+# this module provides a base class for accessing the common
+# dialogues available in Tk 4.2 and newer.  use filedialog,
+# colorchooser, and messagebox to access the individual
+# dialogs.
+#
+# written by Fredrik Lundh, May 1997
+#
+
+from tkinter import *
+
+class Dialog:
+
+    command  = None
+
+    def __init__(self, master=None, **options):
+        self.master  = master
+        self.options = options
+        if not master and options.get('parent'):
+            self.master = options['parent']
+
+    def _fixoptions(self):
+        pass # hook
+
+    def _fixresult(self, widget, result):
+        return result # hook
+
+    def show(self, **options):
+
+        # update instance options
+        for k, v in options.items():
+            self.options[k] = v
+
+        self._fixoptions()
+
+        # we need a dummy widget to properly process the options
+        # (at least as long as we use Tkinter 1.63)
+        w = Frame(self.master)
+
+        try:
+
+            s = w.tk.call(self.command, *w._options(self.options))
+
+            s = self._fixresult(w, s)
+
+        finally:
+
+            try:
+                # get rid of the widget
+                w.destroy()
+            except:
+                pass
+
+        return s