code coverage in python using coverage.py

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:

1. coverage run sample.py
2. kill sample
3. coverage report -m

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

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

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.