Python使用redis pool的一种单例实现方式

import redisclass RedisDBConfig:  HOST = '127.0.0.1'  PORT = 6379  DBID = 0def operator_status(func):  '''''get operatoration status  '''  def gen_status(*args, **kwargs):    error, result = None, None    try:      result = func(*args, **kwargs)    except Exception as e:      error = str(e)    return {'result': result, 'error': error}  return gen_statusclass RedisCache(object):  def __init__(self):    if not hasattr(RedisCache, 'pool'):      RedisCache.create_pool()    self._connection = redis.Redis(connection_pool = RedisCache.pool)  @staticmethod  def create_pool():    RedisCache.pool = redis.ConnectionPool(        host = RedisDBConfig.HOST,        port = RedisDBConfig.PORT,        db  = RedisDBConfig.DBID)  @operator_status  def set_data(self, key, value):    '''''set data with (key, value)    '''    return self._connection.set(key, value)  @operator_status  def get_data(self, key):    '''''get data by key    '''    return self._connection.get(key)  @operator_status  def del_data(self, key):    '''''delete cache by key    '''    return self._connection.delete(key)if __name__ == '__main__':  print RedisCache().set_data('Testkey', "Simple Test")  print RedisCache().get_data('Testkey')  print RedisCache().del_data('Testkey')  print RedisCache().get_data('Testkey')