Brett Cannon added the comment:

I learned a few thing trying to make this work.

One is that the COVERAGE_PROCESS_START does need to point to an actual .ini 
file (which includes an empty file).

 shows that stdlib coverage is left off by this, so even if you do turn on 
tracing in a subprocess, it will still ignore the stdlib. That means the 
coverage config file must turn on stdlib coverage in order or it to be picked 
up in the subprocesses.

Three, you need to run `coverage combine` to create a unified .coverage file 
for `coverage report` to pick up (I don't know if codecov explicitly needs the 
merge step.

When I have time I'll make a PR to test if this change actually helps speed 
things up.


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