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Asked: 2020-01-16 09:35:53 +0800 CST 2020-01-16 09:35:53 +0800 CST

How to create a thread in Python?

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I am writing a code but it has not worked as expected. A simplified version of the code is as follows:

from subprocess import call
import time

call([r"C:\Windows\System32\notepad.exe"])
time.sleep(5)
call(["taskkill", "/im", "notepad.exe"])

When running the script above, the code does not run from the first line call, that is, the script opens the notepad and waits for a response from call([r"C:\Windows\System32\notepad.exe"]), but this only happens when I manually close the notepad.

I would like the script to open the notepad, wait 5 seconds and close it, without manual user intervention. So how can I do it?

python

1 Answers

  1. Best Answer

    What you can do is use Popeninstead of call:

    process = subprocess.Popen('C:\Windows\System32\notepad.exe')

    The subprocess.call function waits for the command to complete, which is why it returns execution control to you when you close the notepad.exe.

    The subprocess.Popen function is executed in a new (child) process.

    After the sleep, you can use the function Popen.killto terminate the process:

    import subprocess
import time

process = subprocess.Popen('C:\Windows\System32\notepad.exe')
time.sleep(5)
process.kill()

    If you want to interact with the thread using Popen(send data to stdin, read from stdoutor stderr), you can use the function Popen.communicate:

    import subprocess

process = subprocess.Popen('C:\comando.exe')
print 'Durante el proceso'
stdout, stderr = process.communicate() # Esperando
print 'Fin del proceso'

    But note that it Popen.communicatewaits for thread completion, so there is no need to usePopen.kill

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