what does 0 mean in MyApp(0)

[Alex]

Thanks for the replies. It seems that I have three options
1. app=MyApp()
2. app=MyApp(0)
3. app=MyApp('myfile.txt')

1. In the first case the output stream will be set to stdout/stderr,
which means that errors will be sent to a window which will be closed
when the app crashes.
2. In the second case the output will be set to the command prompt
window, which means that I will be able to catch the errors when my app
crashes.
3. There is also a third alternative which is to set the output to  a
file.

Alterbnative 2 is simple and useful, so that's why everybody use that
alternative.

Is that correct?
Alex