Calculate function running time using python decorator

The following is an example of using Python decorator to calculate function running time. It has a good reference value and I hope it will be helpful to everyone. Let’s take a look together

Decorators play a very important role in python. If you can use them skillfully, you will greatly improve your work efficiency

Let’s have a look at python decorators today. How it works.

This article mainly uses the python decorator to calculate the function running time

Some programs that need to accurately calculate how long a function has been running can be used This method

#coding:utf-8 
import urllib2,re,time,random,os,datetime
import HTMLParser
import sys 
reload(sys) 
sys.setdefaultencoding('utf-8') 
 
#计算时间函数 
def print_run_time(func): 
 def wrapper(*args, **kw): 
  local_time = time.time() 
  func(*args, **kw) 
  print 'current Function [%s] run time is %.2f' % (func.__name__ ,time.time() - local_time) 
 return wrapper 

class test:
	def __init__(self):
		self.url=''
	#获取网页页面内容
	#即装饰器不管参数有多少，都能使用
	@print_run_time
	def get_html(self,url):
		headers = {'User-Agent':'Mozilla/5.0 (Windows NT 6.2; rv:16.0) Gecko/20100101 Firefox/16.0'}#设置header
		req = urllib2.Request(url=url,headers=headers)
		try:
			html = urllib2.urlopen(req).read().decode('utf-8')
			html=HTMLParser.HTMLParser().unescape(html)#处理网页内容， 可以将一些html类型的符号如" 转换回双引号
			#html = html.decode('utf-8','replace').encode(sys.getfilesystemencoding())#转码:避免输出出现乱码
		except urllib2.HTTPError,e:
			print(2,u"连接页面失败，错误原因： %s" % e.code)
			return None
		except urllib2.URLError,e:
			if hasattr(e,'reason'):
				print(2,u"连接页面失败，错误原因：%s" % e.reason)
				return None
		return html
		
	#在类的内部使用装饰器
	@print_run_time
	def run(self):
		self.url='http://www.baidu.com'
		self.get_html(self.url)
		print 'end'
		
#在外面直接使用装饰器
@print_run_time
def get_current_dir(spath):
	#spath=os.getcwd()
	#spath=os.path.abspath(os.curdir)
		
	for schild in os.listdir(spath): 
		schildpath=spath+'/'+schild 
		if os.path.isdir(schildpath): 
			get_current_dir(schildpath) 
		else: 
			print schildpath 
	
if __name__ == '__main__':
	my_test=test()
	my_test.run()
	spath=os.path.abspath('.')
	get_current_dir(spath)

Running result:

current Function [get_html] run time is 0.29 
end 
current Function [run] run time is 0.29 
05.python_study/03.decorator.py 
current Function [get_current_dir] run time is 0.00

Related recommendations:

Methods in decorated classes based on Python decorator

Use python decorator to log

The above is the detailed content of Calculate function running time using python decorator. For more information, please follow other related articles on the PHP Chinese website!