1,2,3,4共4个问题，2，4是同一类型的，全部放进注释中了

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=())  # 1.target=function，这里的函数加不加括号是一样的吗？
    
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)
    
42. 
    
43. console window output:  # 2.time.perf_counter()是以秒为单位，我的输出相较正确答案大了上万倍
    
44. You eat breakfast
    
45. You drank coffee
    
46. You finish studying
    
47. 1
    
48. [<_MainThread(MainThread, started 14744)>]
    
49. 9517.6617491
    
50. 
    
51. from multiprocessing import Process, cpu_count
    
52. import time
    
53. 
    
54. 
    
55. def counter(num):
    
56.     count = 0
    
57.     while count < num:
    
58.         count += 1
    
59. 
    
60. 
    
61. def main():
    
62. 
    
63.     print(cpu_count())
    
64. 
    
65.     a = Process(target=counter, args=(12500000,))  # 3.Process(target=counter, args=(12500000,))，Pruocess函数的args参数是元组，里面的num元素为什么必须要加","逗号
    
66.     b = Process(target=counter, args=(12500000,))
    
67.     c = Process(target=counter, args=(12500000,))
    
68.     d = Process(target=counter, args=(12500000,))
    
69.     e = Process(target=counter, args=(12500000,))
    
70.     f = Process(target=counter, args=(12500000,))
    
71.     g = Process(target=counter, args=(12500000,))
    
72.     h = Process(target=counter, args=(12500000,))
    
73. 
    
74.     a.start()
    
75.     b.start()
    
76.     c.start()
    
77.     d.start()
    
78.     e.start()
    
79.     f.start()
    
80.     g.start()
    
81.     h.start()
    
82. 
    
83.     a.join()
    
84.     b.join()
    
85.     c.join()
    
86.     d.join()
    
87.     e.join()
    
88.     f.join()
    
89.     g.join()
    
90.     h.join()
    
91. 
    
92.     print("Finished in", time.perf_counter(), "seconds")
    
93. 
    
94. 
    
95. if __name__ == '__main__':
    
96.     main()
    
97. 
    
98. console window output:  # 4.time.perf_counter()是以秒为单位，我的输出相较正确答案大了上万倍
    
99. 16
    
100. Finished in 75426.6729955 seconds

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阿奇_o

都学到线程了， time.perf_counter() 都不会用，即使不会用，也应该会查一下文档或相关例子吧。。

Boibot

阿奇_o 发表于 2022-10-23 15:50
都学到线程了， time.perf_counter() 都不会用，即使不会用，也应该会查一下文档或相关例子吧。。{:10_277: ...

刚学到的，对着视频打完，发现输出跟答案对不上，找了time.perf_counter() 官方文档和一些网站的解释，并不能解释为啥我的输出是上万秒