python 基础进阶1

#类的公有属性

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author :Alvin.xie
# @Time :2017-12-04 16:41
# @file :c1.py


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()
print mc.var3

执行结果：
对象的公有属性 var3

#类的公有方法，私有方法，类方法，静态方法的调用

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author :Alvin.xie
# @Time :2017-12-04 16:51
# @file :c2.py


class MyClass(object):
    name = 'Test'

    def func1(self):
        print self.name,
        print "我是公有方法"
        self.__func2()

    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()
mc.func1()
MyClass.classFun()
MyClass.staticFun()

执行结果：
Test 我是公有方法
Test 我是私有方法
Test 我是类方法
Test 我是静态方法

#编写memcache 启动脚本

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author :Alvin.xie
# @Time :2017-12-04 17:04
# @file :memcache.py
import sys

import os
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 _writePid(self):
        if self.pid:
            with open(self._pidFile(), 'w') as fd:
                fd.write(str(self.pid))

    def start(self):
        self._init()
        cmd = self.program + '' + self.args
        P = Popen(cmd, stdout=PIPE, shell =True)
        self.pid = p.pid
        self._writePid()
        print "%s start Sucessful" % self.name

    def _getPid(self):
        p = Popen(['pidof', self.name], stdout=PIPE)
        pid = p.stdin.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()

执行结果：