Unbuffered python coverage

Question

I want to run application in production with coverage enable. The application is always up and do not stop its execution. In each day I want to see coverage increase. Unfortunately .coverage file appear on the disk only after application stop.

To simulate this behavior I have test.py

# cat test.py 
if 1==2:
    print(1)

if 2==2:
    print(2)

import time

i = 10
while i:
    print("sleep")
    time.sleep(1)
    i -= 1

print("end")

Which is launched like

python3 -u -m coverage run test.py 
2
sleep
sleep
sleep
sleep # I want to be able to see coverage in this moment
sleep
sleep
sleep
sleep
sleep
sleep
end

Only after end word is printed I can see coverage file

ls -a
.  ..  .coverage  test.py

How can I force flushing/Unbuffering on py.coverage ?

I don't understand what you mean by, "In each day I want to see the coverage increase." Why would your application run code on the second day that it didn't run on the first day? — Ned Batchelder
– Ned Batchelder, Commented Oct 2, 2018 at 23:38
it is an interactive application. In day 1 get input A, in day 2 get input B, in day 3 get a combination of A and B so there are 3 branches to cover for three days — Andrei.Danciuc
– Andrei.Danciuc, Commented Oct 3, 2018 at 8:53
What is it you will learn from this coverage measurement? Do you have an automated test suite that can give you coverage numbers? — Ned Batchelder
– Ned Batchelder, Commented Oct 3, 2018 at 12:06
@NedBatchelder I am searching for a solution about HOW ant not WHY to solve something. 1. Of course I do not have automated case for input D,E,F ... (I have only for A, B and C). 2. QA are doing some test each day and I need to be sure that they did their jobs properly. — Andrei.Danciuc
– Andrei.Danciuc, Commented Oct 3, 2018 at 13:37
When I get unusual questions from people using coverage.py, I like to find out as much as I can about their uses. It helps me build a better product. — Ned Batchelder
– Ned Batchelder, Commented Oct 3, 2018 at 18:03

Ned Batchelder · Accepted Answer · 2018-10-02 23:37:33Z

2

There is no way to get coverage.py 4.5.1 to do this. The 5.0 development switched the data storage to SQLite, so we should be able to add a feature to periodically flush the coverage data to the database.

answered Oct 2, 2018 at 23:37

Ned Batchelder

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