new_contents: from ricecooker.classes.nodes import ChannelNode, HTML5AppNode, TopicNode, VideoNode, DocumentNode, AudioNode
  from ricecooker.classes.files import DocumentFile, VideoFile, AudioFile
  from le_utils.constants import licenses
  
  def construct_channel(*args, **kwargs):
  
      """ Start by creating your channel """
      # Let's start by creating your own channel (replace <placeholders> with your own values)
      channel = ChannelNode(
          source_domain = "<yourdomain.org>",     # (e.g. "jamiealexandre.com")
          source_id = "<yourid>",                 # (e.g. "my-sushi-chef")
          title = "Tutorial channel",             # (e.g. "My Sushi Chef Channel")
      )
  
      """ Create topics to add to your channel """
      # Here we are creating a topic named 'Example Topic'
      exampletopic = TopicNode(source_id="topic-1", title="Example Topic")
      # TODO: Create your topic here
  
      # Now we are adding 'Example Topic' to our channel
      channel.add_child(exampletopic)
      # TODO: Add your topic to channel here
  
  
      """ You can also add subtopics to topics """
      # Here we are creating a subtopic named 'Example Subtopic'
      examplesubtopic = TopicNode(source_id="topic-1a", title="Example Subtopic")
      # TODO: Create your subtopic here
  
      # Now we are adding 'Example Subtopic' to our 'Example Topic'
      exampletopic.add_child(examplesubtopic)
      # TODO: Add your subtopic to your topic here
  
  
      """ You can also add pdfs, videos, and audio files to your channel """
      # Next, let's create a document file called 'Example PDF'
      examplepdf = DocumentNode(title="Example PDF", source_id="example-pdf", files=[DocumentFile(path="http://www.pdf995.com/samples/pdf.pdf")], license=licenses.CC_BY_SA)
      # TODO: Create your pdf file here (use any url to a .pdf file)
  
      # We are also going to add a video file called 'Example Video'
      examplevideo = VideoNode(title="Example Video", source_id="example-video", files=[VideoFile(path="https://ia600209.us.archive.org/27/items/RiceChef/Rice Chef.mp4")], license=licenses.CC_BY_SA)
      # TODO: Create your video file here (use any url to a .mp4 file)
  
      # Finally, we are creating an audio file called 'Example Audio'
      exampleaudio = AudioNode(title="Example Audio", source_id="example-audio", files=[AudioFile(path="https://ia802508.us.archive.org/5/items/testmp3testfile/mpthreetest.mp3")], license=licenses.CC_BY_SA)
      # TODO: Create your audio file here (use any url to a .mp3 file)
  
      # Now that we have our files, let's add them to our channel
      channel.add_child(examplepdf) # Adding 'Example PDF' to your channel
      exampletopic.add_child(examplevideo) # Adding 'Example Video' to 'Example Topic'
      examplesubtopic.add_child(exampleaudio) # Adding 'Example Audio' to 'Example Subtopic'
  
      # TODO: Add your pdf file to your channel
      # TODO: Add your video file to your topic
      # TODO: Add your audio file to your subtopic
  
      return channel
  
  
subject: Add original sushi_chef_tutorial.py example