[Python-ideas] Suprocess functionality partitioning

[anatoly techtonik]

Something needs to be done about subprocess API, which got overly
complicated.

The idea is to have:
  shutil.run()  - run command through shell, unsafe
  sys.run()    - run command directly in operating system, ?safe

Both should be API compatible (unblocking stdin/stdout read etc.).
Currently, subprocess calls are unreadable in any Python code - many
conditions makes its behaviour hard to predict and memorize. By
partitioning shell and out-of-shell execution, the documentation will be
easier to grasp and reference to. Maybe it will be even possible to add
some 2D table of various subprocess states that affect behavior.
-- 
anatoly t.
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