def tool(_progname=sys.argv[0],
         _argv=sys.argv[1:],
         _syspath=sys.path,
         _findMachines=findMachines,
         _print=print):
    """
    Entry point for command line utility.
    """

    DESCRIPTION = """
    Visualize automat.MethodicalMachines as graphviz graphs.
    """
    EPILOG = """
    You must have the graphviz tool suite installed.  Please visit
    http://www.graphviz.org for more information.
    """
    if _syspath[0]:
        _syspath.insert(0, '')
    argumentParser = argparse.ArgumentParser(
        prog=_progname,
        description=DESCRIPTION,
        epilog=EPILOG)
    argumentParser.add_argument('fqpn',
                                help="A Fully Qualified Path name"
                                " representing where to find machines.")
    argumentParser.add_argument('--quiet', '-q',
                                help="suppress output",
                                default=False,
                                action="store_true")
    argumentParser.add_argument('--dot-directory', '-d',
                                help="Where to write out .dot files.",
                                default=".automat_visualize")
    argumentParser.add_argument('--image-directory', '-i',
                                help="Where to write out image files.",
                                default=".automat_visualize")
    argumentParser.add_argument('--image-type', '-t',
                                help="The image format.",
                                choices=graphviz.FORMATS,
                                default='png')
    argumentParser.add_argument('--view', '-v',
                                help="View rendered graphs with"
                                " default image viewer",
                                default=False,
                                action="store_true")
    args = argumentParser.parse_args(_argv)

    explicitlySaveDot = (args.dot_directory
                         and (not args.image_directory
                              or args.image_directory != args.dot_directory))
    if args.quiet:
        def _print(*args):
            pass

    for fqpn, machine in _findMachines(args.fqpn):
        _print(fqpn, '...discovered')

        digraph = machine.asDigraph()

        if explicitlySaveDot:
            digraph.save(filename="{}.dot".format(fqpn),
                         directory=args.dot_directory)
            _print(fqpn, "...wrote dot into", args.dot_directory)

        if args.image_directory:
            deleteDot = not args.dot_directory or explicitlySaveDot
            digraph.format = args.image_type
            digraph.render(filename="{}.dot".format(fqpn),
                           directory=args.image_directory,
                           view=args.view,
                           cleanup=deleteDot)
            if deleteDot:
                msg = "...wrote image into"
            else:
                msg = "...wrote image and dot into"
            _print(fqpn, msg, args.image_directory)

    Entry point for command line utility.
    
stackoverflow/venv/lib/python3.6/site-packages/automat/_visualize.py