- new方法实现单例模式
class Singleton(object):
def __new__(cls,*args,**kwargs):
if not hasattr(cls,'_instance'):
cls._instance = super(Singleton,cls).__new__(cls,*args,**kwargs)
return cls._instance
- 装饰器
from time import time
import datetime
def wrap(func):
def timer(*args,**kwargs):
t1 = time()
temp_time = datetime.datetime.now()
func()
t2 = time()
result = t2-t1
start_time = temp_time.strftime('%c')
print('the start time is %s' % start_time)
print("the running time is %f seconds" % result)
return timer
@wrap
def functions():
for i in range(1000):
print (i)
functions()
