More and more packages are listing their dependencies inrequirements.txt which make it trivial to maintain and install them.

toxhttps://pypi.python.org/pypi/tox is a thin wrapper around virtualenvwhich let you craft a fresh python environement to execute command in.It creates the env with virtualenv, install dependencies, run pythonsetup.py install in it and then execute whatever command you want it todo and report status.To do so I simply:- listed tests dependencies in test-requirements.txt (which are just  nose and mock)- provide a tox.ini file which describe how to install the dependencies  and execute nosetests- added the module 'coverage' to the list of test dependenciesTo run tests simply: pip install tox && toxThat will execute the test command 'nosetests' using python2.6 and thenpython 2.7.The additional env 'cover' can be run using: tox -ecover.

Most people know about pep8 which enforce coding style.  pyflakes goes astep beyond by analyzing the code.flake8 is basically a wrapper around both pep8 and pyflakes and comeswith some additional checks.  I find it very useful since you only needto require one package to have a lot of code issues reported to you.This patch provides a 'flake8' tox environement to easily install andrun the utility on the code base.  One simply has to: tox -eflake8The env has been added to the default list of environement to haveflake8 run by default.The repository in its current state does not pass checks but I noticed apull request fixing pep8 issues.  We can later easily ensure there is noregression by adjusting Travis configuration to run this env.More informations about flake8:https://pypi.python.org/pypi/flake8