how to tell nose and coverage not to include files in my virtualenv?

Question

I'm trying to wrangle nose + coverage. If I have this code:

class Foobar(object):
    def add(self, a, b):
        return a + b

And this test:

from unittest import TestCase
from foobar import Foobar

class FoobarTest(TestCase):
    def test_good(self):
        f = Foobar()
        self.assertEquals(f.add(1,2), 3)

Then everything looks good!

$ nosetests
.
Name        Stmts   Miss  Cover   Missing
-----------------------------------------
foobar.py       3      0   100%
----------------------------------------------------------------------
Ran 1 test in 0.018s

OK

But if I add one line to my source code

import requests

class Foobar(object):
    def add(self, a, b):
        return a + b

then I get lots of extra stuff in my report

$ nosetests
.
Name                                                                           Stmts   Miss  Cover   Missing
--------------------------------------------------------------------------------------------------------
foobar.py                                                                      4      0   100%
requests.py                                                                   26      5    81%   54, 72-75
requests/adapters.py                                                         180    134    26%   48, 51, 54, 89-102, 105, 111-117, 1

[snip]

So how do I configure coverage to say "don't bother measuring or reporting anything that is part of my virtualenv -- just do the stuff under my working directory." I'm sure it has something to do with .coveragerc, but I'm having some trouble getting the invocation correct.

Answer 1

Figured it out.

1) Get rid of any coverage-related ini files

2) add this in "nose.cfg" in your home directory for the nose stuff

[nosetests]
with-coverage=1   ; generate a coverage report (in the "cover" directory)
cover-package=.   ; only report on coverage files in the current directory
cover-html=1      ; generate a pretty html report
cover-erase=1     ; re-generate coverage statistics on each run

and of course, you have to be sure that your test files match the testMatch pattern that Nose is looking for.