Python中的类方法及属性总结举例，编写memcached启动脚本举例

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var3print mc.var1print mc._MyClass__var2print mc.var3mc1 = 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.pyimport osimport sysfrom subprocess import Popen,PIPEclass 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()