[issue1329] Different 3.0a1 exit behavior

[Guido van Rossum]

Guido van Rossum added the comment:

Right. I think the right solution is to add an option to _FileIO that
says "don't close the filedescriptor when close() is called". This
option should only be allowed when the "filename" argument is an
integer file descriptor. It should be passed when stdin/out/err are
created. It may also be helpful in some other places?!

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