定义

  1. class Singleton(object):
  2.     """Singleton base class"""
  3.     _instance_lock = _thread.allocate_lock()
  5.     def __init__(self, *args, **kwargs):
  6.         pass
  8.     def __new__(cls, *args, **kwargs):
  9.         if not hasattr(cls, "instance_dict"):
  10.             Singleton.instance_dict = {}
  12.         if str(cls) not in Singleton.instance_dict.keys():
  13.             with Singleton._instance_lock:
  14.                 _instance = super().__new__(cls)
  15.                 Singleton.instance_dict[str(cls)] = _instance
  17.         return Singleton.instance_dict[str(cls)]

使用

  1. class SystemRuning(Singleton):
  2.     def __init__(self):
  3.         pass
  5.     def GetRunStatus(self):
  6.         usr = uos.statvfs("/usr")
  7.         memA = gc.mem_alloc()/1024
  8.         memF = gc.mem_free()/1024
  9.         bak = uos.statvfs("/bak")
  10.         p1=(1-(usr[0] * usr[3])/(usr[0] * usr[2]))*100.00
  11.         p2=(memA/(memF+memA))*100.00
  12.         return "====SystemRun====\r\n==usr:\r\n  文件块数：{}\r\n  文件空间：{}\r\n  可用块数: {}\r\n  可用空间：{} KB\r\n  已使用率：{}%\r\n==bar:\r\n  文件块数：{}\r\n  文件空间：{}\r\n  可用块数: {}\r\n  可用空间：{} KB\r\n===RAM:\r\n  已经使用：{}KB\r\n  剩余可用：{}KB\r\n  已使用率：{}%".format(usr[2],(usr[0] * usr[2])/1024,usr[3],(usr[0]*usr[3])/1024,'%.2f'%p1,bak[0],(bak[0] * bak[2])/1024,bak[3],(bak[0] * bak[3])/1024,'%.2f'%memA,'%.2f'%memF,'%.2f'%p2)

调用

  1. print(SystemRuning())
  2. print(SystemRuning())
  • 打印出来为同一对象
  • 都会执行 __init__ 方法