[Glade-users] blocking some input in entry field

In the entry field that I created in Glade, I would like to block typing anything but digits and dots (IP 
address). I did this in C in _insert_text handler. Now I need to do the same in Python. Any idea how to do 
this in Python?
This is what I have in C:
on_myField_insert_text(*editable, *new_text, new_text_length, position, user_data) {
  /***go through  new_text skipping invalid characters and writing the good ones into a clean_string,
         getting the count of how many valid characters there are. **/
  if (count > 0) {
     g_signal_handlers_block_by_func (GTK_WIDGET(editable), G_CALLBACK(on_myField_insert_text), user_data);
     gtk_editable_insert_text (editable, clean_str, count, position);
     g_signal_handlers_unblock_by_func (GTK_WIDGET(editable), G_CALLBACK(on_myField_insert_text), user_data);
  g_signal_stop_emission_by_name (GTK_WIDGET(editable), "insert-text");
This works in C. How can I get this in Python? I am new to Python, so would be greatfull for your help.
Thanks much.
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