Coverage: code coverage testing for Python

Coverage.py is a Python package that measures code coverage during test
execution.  It uses the code analysis tools and tracing hooks provided in the
Python standard library to determine which lines are executable, and which have
been executed.

For more information, see http://nedbatchelder.com/code/modules/coverage.html
The code is hosted at http://bitbucket.org/ned/coveragepy
