Python中的类方法及属性总结举例,编写memcached启动脚本举例
Python中的类方法及属性总结举例,编写memcached启动脚本举例
发布时间:2020-05-08 10:48:41 来源:网络 阅读:291 作者:枫叶云 栏目:编程语言
1.类的属性总结
类属性,也是公有属性,
类的私有属性, 对象的共有属性, 对象的私有属性, 内置属性, 函数的局部变量, 全局变量,
#/usr/bin/env python # -*- coding:utf-8 -*- class MyClass(object): var1 = '类属性,类的公有属性 var1' __var2 = '类的私有属性 __var2' def func1(self): self.var3 = '对象的公有属性 var3' self.__var4 = '对象的私有属性 __var4' var5 = '函数的局部变量' mc = MyClass() mc.func1() #调用后才测打印出var3 print mc.var1 print mc._MyClass__var2 print mc.var3 mc1 = MyClass() # mc1.func1() #mc1没有调用方法 print mc1.var3 通过类访问: #/usr/bin/env python # -*- coding:utf-8 -*- # @Author :FengXiaoqing # @file :__init__.py.py # var6 = '全局变量 ' class MyClass(object): var1 = '类属性,类的公有属性 var1' ##定义在方法外 __var2 = '类的私有属性 __var2' def func1(self): self.var3 = '对象的公有属性 var3' ##定义在方法内 self.__var4 = '对象的私有属性 __var4' var5 = '函数的局部变量' def func2(self): print self.var1 print self.__var2 print self.var3 print self.__var4 print self.var6 mc = MyClass() mc.func1() mc.func2() print '*'*50 print mc.__dict__ print MyClass.var1 #print MyClass.__var2 #不测通过类访问 print mc.var3 #对象的属性只能通过对象来访问 #print MyClass.__var4 print MyClass.__dict__
2.类的方法总结
公有方法
私有方法
类方法
静态方法
内置方法
class MyClass(object): name = 'Test' def func1(self): print self.name, print "我是公有方法." self.__func2() #func1间接调用了func2的私有方法 def __func2(self): print self.name, print "我是私有方法." def classFun(self): print self.name, print "我是类方法." def staticFun(self): print s.name, print "我是静态方法." mc = MyClass() mc.func1() 调用类方法:用装饰器 @classmethod def classFun(self): print self.name, print "我是类方法." def staticFun(self): print s.name, print "我是静态方法." mc = MyClass() mc.func1() MyClass.classFun() 调用静态方法: @staticmethod def staticFun(): print MyClass.name, print "我是静态方法." mc = MyClass() mc.func1() MyClass.classFun() MyClass.staticFun() 调用内置方法: class MyClass(object): name = 'Test' def __init__(self): self.func1() self.__func2() self.classFun() self.staticFun() def func1(self): print self.name, print "我是公有方法." def __func2(self): print self.name, print "我是私有方法." @classmethod def classFun(self): print self.name, print "我是类方法." @staticmethod def staticFun(): print MyClass.name, print "我是静态方法." mc = MyClass()
3.Python编写memcached启动脚本
测试环境:CentOS 7
Python版本: 2.7
安装memcached:输入下面命令安装并用脚本测试
yum install -y memcached libmemcached libevent
测试方法:把脚本内容粘贴到rc.py文件中,shell下运行如果下命令:
python rc.py start
一、rc 脚本的start、stop、restart、status方法
#/usr/bin/env python # -*- coding:utf-8 -*- # [@Author](https://my.oschina.net/arthor) :FengXiaoqing # [@file](https://my.oschina.net/u/726396) :rc.py import os import sys from subprocess import Popen,PIPE class Process(object): '''memcached rc script''' def __init__(self,name,program,args,workdir): self.name = name self.program = program self.args = args self.workdir = workdir def _init(self): '''/var/tmp/memcached''' if not os.path.exists(self.workdir): os.mkdir(self.workdir) os.chdir(self.workdir) def _pidFile(self): '''/var/tmp/memcached/memcached.pid''' return os.path.join(self.workdir,"%s.pid" % self.name) def _writhPid(self): if self.pid: with open(self._pidFile(),'w') as fd: fd.write(str(self.pid)) def start(self): pid = self._getPid() if pid: print "%s is already runnig..." % self.name sys.exit() self._init() cmd = self.program + ' ' + self.args p = Popen(cmd,stdout=PIPE,shell=True) self.pid = p.pid self._writhPid() print "%s start Sucessful.." % self.name def _getPid(self): p = Popen(['pidof',self.name],stdout = PIPE) pid = p.stdout.read().strip() return pid def stop(self): pid = self._getPid() if pid: os.kill(int(pid),15) if os.path.exists(self._pidFile()): os.remove(self._pidFile()) print ("%s is stopped .") % self.name def restart(self): self.stop() self.start() def status(self): pid = self._getPid() if pid: print "%s is already running..." % self.name else: print "%s is not running..." % self.name def _help(self): print ("Usage: %s {start|stop|status|restart}") % __file__ def main(): name = 'memcached' prog = '/usr/bin/memcached' args = '-u nobody -p 11211 -c 1024 -m 64' wd = '/var/tmp/memcached' pm = Process(name = name, program=prog, args=args, workdir=wd) try: cmd = sys.argv[1] except IndexError,e: print ("Option error") sys.exit() if cmd == 'start': pm.start() elif cmd == 'stop': pm.stop() elif cmd == 'restart': pm.restart() elif cmd == 'status': pm.status() else: pm._help() if __name__ == '__main__': main()
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