python装饰器常见使用方法分析

#coding:utf-8
import time
def timeit(func):
  def wrapper(*args, **kv):
    start = time.clock()
    print '开始执行'
    func(*args, **kv)
    end =time.clock()
    print '花费时间:', end - start
  return wrapper
@timeit
def foo():
  print 'in foo()'
if __name__=='__main__':
  foo()

#coding:utf-8
import time
def timeit(func):
  def wrapper(*args, **kv):
    start = time.clock()
    print '开始执行'
    func(*args, **kv)
    end =time.clock()
    print '花费时间:', end - start
  return wrapper
class MySpendTime(object):
  def __init__(self):
    pass
  @timeit
  def foo(self):
    print 'in foo()'
spendtime=MySpendTime()
spendtime.foo()

#coding:utf-8
'''
Created on 2012-11-1
@author: yihaomen.com
'''
def UpdateUI(msg, step):
  print u"内容:", msg
  print u"步骤:到第%s步了" % step
  def dec(func):
    def wapper(self, *args, **kwargs):
      func(self,*args, **kwargs)
    return wapper
  return dec
class Command(object):
  def Excute(self):
    self.Work1st()
    self.Work2nd()
    self.Work3rd()
  @UpdateUI("开始第一步","1")
  def Work1st(self):
    print "Work1st"
  @UpdateUI("开始第二步", 2)
  def Work2nd(self):
    print "Work2nd"
  @UpdateUI("开始第三步", 3)
  def Work3rd(self):
    print "Work3rd"
if __name__=="__main__":
  command = Command()
  command.Excute()