在python中运行进程时执行某些操作

Question

在一个进程之间执行其他操作

我想在python中运行一个进程，当进程花费超过10秒时，我想做一些事情，比如打印(等待它完成。(

该打印必须在进程运行时打印

如果你知道我如何在代码中做到这一点，请告诉我

Answer 1

您应该使用thread对应用程序进行多线程处理。

例如：

import time
import threading
def long_running():
print("long_running started")
time.sleep(10)
print("long_running finished")
x = threading.Thread(target=long_running)
x.start()
print("running something while long_running is running in background")

输出(在REPL上(：

$ python3
Python 3.9.5 (default, May  9 2021, 14:00:28) 
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import time
>>> import threading
>>> 
>>> def long_running():
...   print("long_running started")
...   time.sleep(10)
...   print("long_running finished")
... 
>>> x = threading.Thread(target=long_running)
>>> x.start()
long_running started
>>> print("running something while long_running is running in background")
running something while long_running is running in background
>>> long_running finished

输出(从文件运行时(：

$ python3 /tmp/a.py
long_running started
running something while long_running is running in background
long_running finished

关于线程的进一步阅读：https://realpython.com/intro-to-python-threading/

Answer 2

您可以使用时间模块。

这里有一个非常基本的例子：

import time
t0 = time.time()
m = 'hello world'
print(m)
for i in range(5):
t1 = time.time()
if t1 - t0 > 10:
print('more than 10 seconds has passed')
time.sleep(5)
print('test', i)

还有其他方法，例如threading。