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So the issue can be closed:
- subprocess was rewritten in C on Python3 for good reasons: it's wrong (and dangerous) to run Python code between fork() and exec(); this bug report is another example.
- This change is too large to be merged to 2.7.
- There is a backport available on pypi: https://pypi.python.org/pypi/subprocess32
Yes it's a distinct module, but it's possible to install it in place of the standard one if needed::
 import sys
 import subprocess32 as subprocess
 sys.modules['subprocess'] = subprocess