Question

我想要这样的代码：

if True:
    run('ABC.PY')
else:
    if ScriptRunning('ABC.PY):
       stop('ABC.PY')
    run('ABC.PY'):

基本上，我想根据某些条件运行一个文件，例如abc.py。我想停止它，然后从另一个python脚本再次运行它。有可能吗？

我正在使用Windows。

Answer 1

您可以使用python Popen对象在子进程中运行进程

因此run('ABC.PY')将是p = Popen("python 'ABC.PY'")

if ScriptRunning('ABC.PY)将是if p.poll() == None

stop('ABC.PY')将是p.kill()

Answer 2

这是您要实现的目标的非常基本的示例

请签出子流程。打开文档以微调您运行脚本的逻辑

import subprocess
import shlex
import time


def run(script):
    scriptArgs = shlex.split(script)
    commandArgs = ["python"]
    commandArgs.extend(scriptArgs)
    procHandle = subprocess.Popen(commandArgs, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    return procHandle


def isScriptRunning(procHandle):
    return procHandle.poll() is None


def stopScript(procHandle):
    procHandle.terminate()
    time.sleep(5)
    # Forcefully terminate the script
    if isScriptRunning(procHandle):
        procHandle.kill()


def getOutput(procHandle):
    # stderr will be redirected to stdout due "stderr=subprocess.STDOUT" argument in Popen call
    stdout, _ = procHandle.communicate()
    returncode = procHandle.returncode
    return returncode, stdout

def main():
    procHandle = run("main.py --arg 123")
    time.sleep(5)
    isScriptRunning(procHandle)
    stopScript(procHandle)
    print getOutput(procHandle)


if __name__ == "__main__":
    main()

您应该了解的一件事是stdout = subprocess.PIPE。如果您的python脚本输出很大，则管道可能会溢出，导致脚本阻塞，直到通过句柄调用.communicate为止。为了避免这种情况，将文件句柄传递给stdout，就像这样

fileHandle = open("main_output.txt", "w")
subprocess.Popen(..., stdout=fileHandle)

这样，python进程的输出将被转储到文件中（为此您也必须修改getOutput（）函数）

Answer 3

import subprocess

process = None

def run_or_rerun(flag):
    global process
    if flag:
        assert(process is None)
        process = subprocess.Popen(['python', 'ABC.PY'])
        process.wait() # must wait or caller will hang
    else:
        if process.poll() is None: # it is still running
            process.terminate() # terminate process
        process = subprocess.Popen(['python', 'ABC.PY']) # rerun
        process.wait() # must wait or caller will hang

如何从另一个python脚本运行和停止python脚本？

3 个答案: