[issue16624] subprocess.check_output should allow specifying stdin as a string

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I partially agree with you. We must copy blocks in communicate().

Your patch is great, but I doubt that there is a best feature. If we teach communicate() to work with file-like objects, this feature will exceed your suggestion and 'input' parameter of check_output() will be redundant. Are you want to implement a more powerful feature? If not, I will commit your patch. But I hope that before the 3.4 release we will replace it with a more powerful feature.

Mark, can you please run subprocesses tests on Windows?

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