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From: rbowman <bowman@montana.com>
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Subject: Re: What programs do you make sure are installed on a new Linux
Date: 17 Jul 2024 23:31:22 GMT
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On Wed, 17 Jul 2024 22:48:39 -0000 (UTC), Lawrence D'Oliveiro wrote:

> Another weird distinction: non-console applications don’t get any
> standard input/output/error streams, and will abort if they try to
> access them

I can't address what goes on in pythonw but in a straight service

    [DllImport("kernel32.dll")]
    static extern bool AttachConsole(int dwProcessId);
    private const int ATTACH_PARENT_PROCESS = -1;
    static void Main()
    {
      string[] args = Environment.GetCommandLineArgs();
      foreach (string arg in args)
      {
        if (arg == "-v")
        {
          AttachConsole(ATTACH_PARENT_PROCESS);
          Console.WriteLine("{0} version {1}",
              Assembly.GetExecutingAssembly().GetName().Name,
              Assembly.GetExecutingAssembly().GetName().Version);
          return;
        }
      }

works nicely if you want to print the version and exit rather than running 
the service.