from fabric_verbose import verbose

# ...

def deploy():
     with verbose("Discarding local changes") as v:
         v.run('git reset HEAD; git clean -fd; git checkout .')

     with verbose("Pulling source code") as v:
         v.run('git pull')

     with verbose("Installing requirements") as v:
         v.run('pip install -r requirements.txt')

     with verbose("Starting") as v:
         v.run('fab start')