python: execute command in Windows-Service

问题

I am working on Windows-service written in Python. I'd like to notify user about something, since it seems it cannot be done in service itself I've compiled small program tip.exe, that pops task-bar notifications. Usage is: path/to/tip.exe "title" "notification text" If I use it manully in cmd it works, but all my attempts:

 command='"{}" "{}" "{}"'.format(balloon_exe, title, message)
result=subprocess.Popen(command, shell=True, stderr=subprocess.PIPE, stdout=subprocess.PIPE )
        output, errors = result.communicate()
#######
os.system(command)
#######
os.popen(command)

And some others. There is no error output nor exception... Anyone could help me, please?

来源：https://stackoverflow.com/questions/37058958/python-execute-command-in-windows-service