code: def install(environment, opts):
      
      environment.require_data()
      install_all(environment, opts['--clean'], verbose=not opts['--quiet'],
          packages=opts['PACKAGE'])
  
      for site in environment.sites:
          environment = Environment.load(environment.name, site)
          if 'web' in environment.containers_running():
              # FIXME: reload without changing debug setting?
              manage.reload_(environment, {
                  '--address': opts['--address'],
                  '--background': False,
                  '--no-watch': False,
                  '--production': False,
                  'PORT': None,
                  '--syslog': False,
                  '--site-url': None,
                  '--interactive': False
                  })
docs: Install or reinstall Python packages within this environment
  
  Usage:
    datacats install [-q] [--address=IP] [ENVIRONMENT [PACKAGE ...]]
    datacats install -c [q] [--address=IP] [ENVIRONMENT]
  
  Options:
    --address=IP          The address to bind to when reloading after install
    -c --clean            Reinstall packages into a clean virtualenv
    -q --quiet            Do not show output from installing packages and requirements.
  
  ENVIRONMENT may be an environment name or a path to an environment directory.
  Default: '.'