Class to create a subprocess with a watchdog

Subprocess_class.py

import time
import subprocess
import datetime

"""
This class is used to execute a subprocess including a watchdog
"""
class Subprocess(object):
    def __init__(self, cmd, cwd=None, stdout=None):
        self.cmd = cmd
        self.cwd = cwd
        self.process = None
        self.stdout = stdout
        self.thread = None

    def run(self):
        self.process = subprocess.Popen(self.cmd,
                                            stdout=self.stdout,
                                            cwd=self.cwd)
        self.start_time = datetime.datetime.now()

    def wait(self, timeout):

        while self.process.poll() is None:
            time.sleep(1)
            if (datetime.datetime.now()-self.start_time).total_seconds() >= \
                                                                timeout:
                break
        returncode = self.process.poll()
        if returncode is None:
            print("Killing process (timeout) %s", self.cmd)
            try:
                self.process.kill()
            except:
                pass
        
        return returncode
        
        
#To run
my_process = Subprocess(cmd=["./process", "param1", "param2"],
                                       stdout=subprocess.PIPE, 
                                       cwd="/home/user/path")
my_process.run()
my_process.wait(30) #Waiting time in seconds