added ex37

ex_37.py

@@ -0,0 +1,33 @@
+import tkinter
+
+messages = {"python": "Ok do that"
+	, "C": "Ok that is fine"
+	, "Fortran": "Weird but ok"
+	, "Perl": "Go back to your BDSM buddies"
+	, "Haskell": "Weird flex but ok"
+}
+
+root = tkinter.Tk()
+selection = tkinter.StringVar()
+
+textbox = tkinter.Text(root, height=1, width=30)
+textbox.pack(anchor=tkinter.W)
+
+def on_selection_changed():
+	my_selection = selection.get()
+	on_selection_changed_callback(my_selection)
+
+for s in messages.keys():
+	r = tkinter.Radiobutton(root, text=s, command=on_selection_changed
+					, variable=selection
+					, value=s)
+	r.pack(anchor=tkinter.W)
+
+
+def on_selection_changed_callback(selection):
+	textbox.delete("1.0", tkinter.END)
+	textbox.insert(tkinter.END, messages[selection])
+
+
+
+root.mainloop()