Python实现监控程序执行时间并将其写入日志的方法

# /usr/bin/python
# -*- coding:utf-8 -*-
from time import time
def logged(when):
 def log(f,*args,**kargs):
 print '''
 called:
 functions:%s
 args: %r
 kargs: %r
 ''' % (f,args,kargs)
 def pre_logged(f):
 def wrapper(*args,**kargs):
 log(f,*args,**kargs)
 return f(*args,**kargs)
 return wrapper
 def post_logged(f):
 def wrapper(*args,**kargs):
 now = time()
 try:
 return f(*args,**kargs)
 finally:
 log(f,*args,**kargs)
 print "time delta:%s" % (time()-now)
 return wrapper
 try:
 return {"pre":pre_logged,"post":post_logged}[when]
 except KeyError,e:
 raise ValueError(e),'must be "pre" or "post"'
@logged("post")
def hello(name):
 print "hello,",name
hello("world!")
'''
等同于： hello = logged("post")(hello("world!"))
'''