code: def demo(ctx):
      """Run the demo"""
      header(demo.__doc__)
      with ctx.cd(ROOT):
          ctx.run("python examples/todo.py")
  
imports: from __future__ import unicode_literals, absolute_import
  import os
  import sys
  from datetime import datetime
  from invoke import task
label_desc: Use image node_id 10 for calling a global function with example usage: demo(ctx) without return types