[issue23347] asyncio: fix and refactor creation of subprocess transports

[STINNER Victor]

STINNER Victor added the comment:

I commited my change with small changes.

"wait() is a coroutine, which is something uncommon. Is it ok to start using coroutines in transports, at least for subprocess transports?"

I made the method private (renamed to _wait()).

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resolution:  -> fixed
status: open -> closed

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<http://bugs.python.org/issue23347>
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