code coverage in python using coverage.py

Question

I am trying to understand running coverage for python scripts. I am not able to understand a scenario where i try to run coverage for a simple script which has an infinite loop:

#!/usr/bin/python

print "The only statement!!!"

while True:
    pass

After invoking coverage for this script, I will kill this process, since it is an infinite loop and if i try to get the result I am getting like:

coverage run sample.py
kill sample
coverage report -m

Name Stmts Miss Cover Missing -------------------------------------

I am not getting any coverage report. Am i doing some thing which is fundamentally wrong?

Can you include the console output from the steps above?

John Keyes
– John Keyes

2014-08-26 10:14:24 +00:00
Commented Aug 26, 2014 at 10:14 — John Keyes
– John Keyes, Commented Aug 26, 2014 at 10:14

snowcrash09 · Accepted Answer · 2014-08-26 10:56:28Z

5

coverage needs to be able to write its data out at program end, and if it can't handle the exit signal then it will not generate a report.

So it depends how you are killing your process and how coverage handles the signal - works fine for me when using Ctrl+C (i.e. sending SIGINT) to interrupt sample.py

$ coverage run sample.py
The only statement!!!
Traceback (most recent call last):
  File "sample.py", line 5, in <module>
    while True:
KeyboardInterrupt

$ coverage report -m
Name     Stmts   Miss  Cover   Missing
--------------------------------------
sample       3      0   100%

If you are using the kill utility with no options then you are sending SIGTERM by default, try kill -INT <pid> instead.

edited Aug 26, 2014 at 10:56

answered Aug 26, 2014 at 10:16

snowcrash09

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3 Comments

Vijay Over a year ago

Thanks. That worked. Now i have a different problem. Coverage.py's documentation says, it doesnt work well with thread module. So is there any other coverage tool for python that supports thread also?

snowcrash09 Over a year ago

I don't know about other coverage tools, but this documentation page for Coverage.py says it will work fine if you use the higher-level threading interface. So you could wrap your thread functions with thread classes.

Vijay Over a year ago

Thanks. That helped. Also i found that to get coverage results you should use sys.exit on all threads.

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