code: def normalize_flags(self, flags):
          
          flags['type'] = flags.get('type', None)
          paction = flags.get('action', 'store')
          if paction == 'store_false':
              flags['default'] = True 
              flags['type'] = bool
  
          elif paction == 'store_true':
              flags['default'] = False
              flags['type'] = bool
  
          prequired = False if 'default' in flags else flags.get('required', True)
  
          flags["action"] = paction
          flags["required"] = prequired
          self.flags = flags
docs: normalize the flags to make sure needed values are there
  
          after this method is called self.flags is available
  
          :param flags: the flags that will be normalized