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
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