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,
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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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