code: def mss(**kwargs):
      # type: (Any) -> MSSMixin
      
  
      os_ = platform.system().lower()
  
      if os_ == "darwin":
          from . import darwin
  
          return darwin.MSS(**kwargs)
  
      if os_ == "linux":
          from . import linux
  
          return linux.MSS(**kwargs)
  
      if os_ == "windows":
          from . import windows
  
          return windows.MSS(**kwargs)
  
      raise ScreenShotError("System {!r} not (yet?) implemented.".format(os_))
docs: Factory returning a proper MSS class instance.
  
          It detects the plateform we are running on
          and choose the most adapted mss_class to take
          screenshots.
  
          It then proxies its arguments to the class for
          instantiation.