new_contents: import os
  import sys
  
  from yaku.context \
      import \
          get_bld, get_cfg
  
  # Use cases:
  #   - just load the tool, its configuration should be automatic, and
  #   building is one function call away
  #   - customizing tool configuration
  def configure(ctx):
      tools = ctx.use_tools(["pyext", "ctasks"], ["tools"])
  
  def build(ctx):
      python_builder = ctx.builders["pyext"]
      python_builder.extension("_bar", ["src/hellomodule.c"])
  
  if __name__ == "__main__":
      ctx = get_cfg()
      configure(ctx)
      ctx.store()
  
      ctx = get_bld()
      build(ctx)
      ctx.store()
  
subject: add new example using simple API only.