timeit 模块详解（准确测量小段代码的执行时间）

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1. >>> import timeit
   
2. >>> import timeit
   
3. >>> timeit.timeit('"-".join(str(n) for n in range(100))',number=10000)
   
4. 0.22145586600001366
   
5. >>> timeit.timeit('"-".join(str(n) for n in range(100))',number=100000)
   
6. 2.19172915499999
   
7. >>> timeit.timeit('a = "-".join(str(n) for n in range(100))',number=10000)
   
8. 0.22280868299998247
   
9. >>> timeit.timeit('a = "-".join(str(n) for n in range(100));return a',number=10000)
   
10. >>> timeit.timeit('a = "-".join(str(n) for n in range(100))',repeat=3,number=10000)
    
11. Traceback (most recent call last):
    
12.   File "<pyshell#9>", line 1, in <module>
    
13.     timeit.timeit('a = "-".join(str(n) for n in range(100))',repeat=3,number=10000)
    
14. TypeError: timeit() got an unexpected keyword argument 'repeat'
    
15. >>> timeit.repeat('a = "-".join(str(n) for n in range(100))',repeat=3,number=10000)
    
16. [0.21651620500006175, 0.22220623099997283, 0.21522767299995849]
    
17. >>> timeit.repeat('a = "-".join(str(n) for n in range(100))',timer = <process_time()>,repeat=3,number=10000)
    
18. SyntaxError: invalid syntax
    
19. >>> timeit.repeat('a = "-".join(str(n) for n in range(100))',timer =<process_time()>,repeat=3,number=10000)
    
20. SyntaxError: invalid syntax
    
21. >>> timeit.repeat('a = "-".join(str(n) for n in range(100))',timer = process_time(),repeat=3,number=10000)
    
22. Traceback (most recent call last):
    
23.   File "<pyshell#13>", line 1, in <module>
    
24.     timeit.repeat('a = "-".join(str(n) for n in range(100))',timer = process_time(),repeat=3,number=10000)
    
25. NameError: name 'process_time' is not defined
    
26. >>> timeit.Timer('for i in range(10): oct(i)', 'gc.enable()').timeit()
    
27. 1.1840565520001292
    
28. >>> timeit.Timer('for i in range(10): oct(i)', 'gc.enable()')
    
29. <timeit.Timer object at 0x000002311996BFD0>
    
30. >>> a=timeit.Timer('for i in range(10): oct(i)', 'gc.enable()')
    
31. >>> a
    
32. <timeit.Timer object at 0x00000231199A5EF0>
    
33. >>> a.timeit()
    
34. 1.2091490960001465
    
35. >>> a.repeat()
    
36. [1.1775791850000132, 1.2054382349999742, 1.1808787390000361, 1.1793837000000167, 1.1820034329998634]
    
37. >>> s = '''\
    
38. try:
    
39.         str.__bool__
    
40. except AttributeError:
    
41.         pass
    
42. '''
    
43. >>> timeit.timeit(stmt=s, number = 100000)
    
44. 0.041749605999939376
    
45. >>> s = 'if hasattr(str,"__bool__"):pass'
    
46. >>> timeit.timeit(stmt=s, number = 100000)
    
47. 0.027976809999927355
    
48. >>> s = '''\
    
49. try:
    
50.         int.__bool__
    
51. except AttributeError:
    
52.         pass
    
53. '''
    
54. >>> timeit.timeit(stmt=s, number = 100000)
    
55. 0.004601171999865983
    
56. >>> s = 'if hasattr(int,"__bool__"):pass'
    
57. >>> timeit.timeit(stmt=s, number = 100000)
    
58. 0.006767500000023574

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timeit，repeat方法中的timer的使用，暂时还未掌握

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小甲鱼你写错别字了，是大有裨益哈哈哈。。.

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