code: def get_int_from_user(self, title="Enter integer value",
                            cond_func=lambda i: i is not None):
          
  
          is_integer = False
  
          while not is_integer:
              dlg = wx.TextEntryDialog(None, title, title)
  
              if dlg.ShowModal() == wx.ID_OK:
                  result = dlg.GetValue()
              else:
                  return None
  
              dlg.Destroy()
  
              try:
                  integer = int(result)
  
                  if cond_func(integer):
                      is_integer = True
  
              except ValueError:
                  pass
  
          return integer
docs: Opens an integer entry dialog and returns integer
  
          Parameters
          ----------
          title: String
          \tDialog title
          cond_func: Function
          \tIf cond_func of int(<entry_value> then result is returned.
          \tOtherwise the dialog pops up again.