I think the issue is grossly underspecified. The title of the issue is "sys.stdin is broken" which says nothing about the way in which it is broken. Taking Roger's literal description, and his msg165191, the complaint is that input() no longer works, as doesn't readline and isatty.

Since this was what Roger opened the issue for, I declare this to be the issue being dealt with here. I agree that Serhiy's patch is a proper resolution of the issue.

Roger, please refrain from trying to put issues in a broader scope, unless you make an explicit specification what exactly is in scope and what is out of scope. I readily agree that there are many issues with stdin and stdout in IDLE; I don't agree that easily that they all deserve being resolved. I entirely, completely, absolutely disagree that they are related to what you originally submitted as this issue, as I firmly, deeply convinced believe that the fixes to the other issues will be different from the proper fix to this issue. So please, please, please don't mix issues.