code: def open_(environment, opts):
      # pylint: disable=unused-argument
      
  
      environment.require_data()
      addr = environment.web_address()
      if not addr:
          print "Site not currently running"
      else:
          webbrowser.open(addr)
docs: Open web browser window to this environment
  
  Usage:
    datacats open [-r] [-s NAME] [ENVIRONMENT]
  
  Options:
    -s --site=NAME     Choose a site to open [default: primary]
  
  ENVIRONMENT may be an environment name or a path to an environment directory.
  Default: '.'