python timeit

//有时候，我们想知道一个函数的计算耗时，那么，你可以用timeit

//test.py

1 import timeit

2

3 def func():

4         s = 0

5         for i in range(1000):

6                 s += i

7         pass

8

9 def test_range(n):

10         for i in range(n):

11                 pass

12

13 def test_xrange(n):

14         for i in xrange(n):

15                 pass

16 t = timeit.timeit('test_range(100)', 'from __main__ import test_range', number=1000)

17 print(t)

18 t = timeit.timeit('test_range(100)', 'from __main__ import test_range', number=10000)

19 print(t)

20 t = timeit.timeit('test_xrange(100)', 'from __main__ import test_xrange', number=10000)

21 print (t)

//result

# python test.py
0.00116419792175
0.0125250816345
0.0108740329742

Finally:

xrange比range要快