Benjamin Peterson added the comment: This code is pretty broken. I don't think ttys are ever seekable, so the os.fdopen has probably been always failing since 3.0. It thus always leaks an fd to '/dev/tty' if the first os.open succeeds. The whole function should probably be rewriten to work with byte streams encoding the prompt with os.device_encoding(tty_fd) falling back on locale.getpreferredencoding().
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