code: def get_all_data_from_cache(self, filename=''):
          ''' Reads the JSON inventory from the cache file. Returns Python dictionary. '''
  
          data = ''
          if not filename:
              filename = self.cache_path_cache
          with open(filename, 'r') as cache:
              data = cache.read()
          return json.loads(dataf get_all_data_from_cache(self, filename=''):
          ''' Reads the JSON inventory from the cache file. Returns Python dictionary. '''
  
          data = ''
          if not filename:
              filename = self.cache_path_cache
          with open(filename, 'r') as cache:
              data = cache.read()
          return json.loads(data)
docs: Reads the JSON inventory from the cache file. Returns Python dictionary.