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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _fastfood_list(args):
 """Run on `fastfood list`."""

    template_pack = pack.TemplatePack(args.template_pack)
    if args.stencil_set:
        stencil_set = template_pack.load_stencil_set(args.stencil_set)
        print("Available Stencils for %s:" % args.stencil_set)
        for stencil in stencil_set.stencils:
            print("  %s" % stencil)
    else:
        print('Available Stencil Sets:')
        for name, vals in template_pack.stencil_sets.items():
            print("  %12s - %12s" % (name, vals['help']))