code: def get_table_cache_key(db_alias, table):
      
      cache_key = '%s:%s' % (db_alias, table)
      return sha1(cache_key.encode('utf-8')).hexdigest()
docs: Generates a cache key from a SQL table.
  
      :arg db_alias: Alias of the used database
      :type db_alias: str or unicode
      :arg table: Name of the SQL table
      :type table: str or unicode
      :return: A cache key
      :rtype: int