tox is happy
```
$ tox | grep "def python_module ="
def python_module = 'swh.indexer'
def python_module = 'swh.core'
def python_module = 'swh.deposit'
def python_module = 'swh.fuse'
def python_module = 'swh.graph'
def python_module = 'swh.icinga_plugins'
def python_module = 'swh.journal'
def python_module = 'swh.loader.core'
def python_module = 'swh.loader.git'
def python_module = 'swh.loader.mercurial'
def python_module = 'swh.loader.svn'
def python_module = 'swh.lister'
def python_module = 'swh.model'
def python_module = 'swh.objstorage'
def python_module = 'swh.objstorage.replayer'
def python_module = 'swh.scheduler'
def python_module = 'swh.search'
def python_module = 'swh.storage'
def python_module = 'swh.scanner'
def python_module = 'swh.vault'
def python_module = 'swh.web'
def python_module = 'swh.web.client'
```