解决方法（伪）在python中装饰for循环？

Question

我当然知道这是不能直接在Python中，在

Statement decorators

读，但我仍想找到一种方法，以编程方式打开（和关闭）的循环为：

for i in range(L[:]): 
    # do stuff 

到

for i in range(L[0:N])): 
    # estimate how much time it 
    # took to run the loop over a subset N element of the list 
for i in range(L): 
    # do stuff on the full list 

有任何Python的方式这样做呢？

Answer 1

假设L是一个列表

import time 

def timed_loop(L,subset,timeout): 
    start = time.time() 
    for i in L[0:subset]: 
     do_something() 
    stop = time.time() 
    if stop-start < timeout: 
     for i in L: 
      do_something_else()