如何在Python脚本中调用外部命令(就像我在Unix shell或Windows命令提示符下键入它一样)?
我在Python 3中生成具有超时的异步子进程时遇到问题.
我想要实现的目标:我希望异步生成多个进程而不等待结果,但我还要确保每个生成的进程都会在给定的超时内结束.
我在这里发现了类似的问题:在Python中使用模块'subprocess'和超时以及异步后台进程?但他们没有解决我的问题.
我的代码看起来像这样.我有使用模块'subprocess'和超时建议的Command类:
class Command(object):
def __init__(self, cmd):
self.cmd = cmd
self.process = None
def run(self, timeout):
def target():
print('Thread started')
args = shlex.split(self.cmd)
self.process = subprocess.Popen(args, shell=True)
self.process.communicate()
print('Thread finished')
thread = threading.Thread(target=target)
thread.start()
thread.join(timeout)
if thread.is_alive():
print('Terminating process')
self.process.terminate()
thread.join()
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然后当我想要产生子进程时:
for system in systems:
for service in to_spawn_system_info:
command_str = "cd {0} && python proc_ip.py {1} {2} 0 2>>{3}".format(home_dir,
service, system, service_log_dir)
command = Command(command_str)
command.run(timeout=60)
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当我运行它时,输出似乎等待每个命令生成并结束.我明白了
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