Issue #22823: Fixed an output of sets in examples.

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branch : 3.4
Issue 22823: Use set literal in idlelib.

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branch : 3.4
asyncio, tulip issue 202: Add unit test of pause/resume writing for proactor
socket transport

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branch : 3.4
asyncio, tulip issue 209: Fix subprocess for close_fds=False on Python 3.3

Mark the write end of the stdin pipe as non-inheritable.

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branch : 3.4