time.perf_counter()返回性能计数器的值（以秒的小数部分为单位),我的输出不符标准

Boibot

1. import threading  # 线程模块
   
2. import time
   
3. 
   
4. 
   
5. def eat_breakfast():
   
6.     time.sleep(3)
   
7.     print("You eat breakfast")
   
8. 
   
9. 
   
10. def drink_coffee():
    
11.     time.sleep(4)
    
12.     print("You drank coffee")
    
13. 
    
14. 
    
15. def study():
    
16.     time.sleep(5)
    
17.     print("You finish studying")
    
18. 
    
19. 
    
20. x = threading.Thread(target=eat_breakfast, args=())
    
21. x.start()
    
22. 
    
23. y = threading.Thread(target=drink_coffee, args=())
    
24. y.start()
    
25. 
    
26. z = threading.Thread(target=study, args=())
    
27. z.start()
    
28. 
    
29. x.join()     # thread synchronization(线程同步)
    
30. y.join()     # thread synchronize and join(线程同步并加入)
    
31. z.join()
    
32. 
    
33. 
    
34. # eat_breakfast()
    
35. # drink_coffee()
    
36. # study()
    
37. 
    
38. 
    
39. print(threading.active_count())  # 函数名活动计数
    
40. print(threading.enumerate())  # 函数名枚举
    
41. print(time.perf_counter())  # performance counter function(函数名性能计数器)

复制代码

console window:
You eat breakfast
You drank coffee
You finish studying
1
[<_MainThread(MainThread, started 14744)>]
9517.6617491

Boibot

视频教程输出只有5.1390643s，我的输出是9517.6617491s，这没道理呀