code: def refresh_cache(self, cat_id):
          '''
          Repopulate cache
          '''        
          self.cache[cat_id] = most_recent_25_posts_by_category(cat_id)
          self.last_refresh[cat_id] = datetime.now()
          print ('Cache refresh at...', str(self.last_refresh[cat_id])f refresh_cache(self, cat_id):
          '''
          Repopulate cache
          '''        
          self.cache[cat_id] = most_recent_25_posts_by_category(cat_id)
          self.last_refresh[cat_id] = datetime.now()
          print ('Cache refresh at...', str(self.last_refresh[cat_id]))
docs: Repopulate cache