def print_usage(actions):
    actions = actions.items()
    actions.sort()
    print('usage: %s <action> [<options>]' % basename(sys.argv[0]))
    print('       %s --help' % basename(sys.argv[0]))
    print()
    print('actions:')
    for name, (func, doc, arguments) in actions:
        print('  %s:' % name)
        for line in doc.splitlines():
            print('    %s' % line)
        if arguments:
            print()
        for arg, shortcut, default, argtype in arguments:
            if isinstance(default, bool):
                print('    %s' % (
                    (shortcut and '-%s, ' % shortcut or '') + '--' + arg
                ))
            else:
                print('    %-30s%-10s%s' % (
                    (shortcut and '-%s, ' % shortcut or '') + '--' + arg,
                    argtype, default
                ))
        print()
Print the usage information.  (Help screen)
dataset/ETHPy150Open Eforcers/gae-flask-todo/lib/werkzeug/script.py/print_usage