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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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