How to use the supervisor.datatypes.byte_size function in supervisor

self.assertEqual(options.nocleanup, True)
        self.assertEqual(len(options.programs), 3)

        cat = options.programs[0]
        self.assertEqual(cat.name, 'cat')
        self.assertEqual(cat.command, '/bin/cat')
        self.assertEqual(cat.priority, 1)
        self.assertEqual(cat.autostart, True)
        self.assertEqual(cat.autorestart, True)
        self.assertEqual(cat.startsecs, 5)
        self.assertEqual(cat.startretries, 10)
        self.assertEqual(cat.uid, 0)
        self.assertEqual(cat.logfile, '/tmp/cat.log')
        self.assertEqual(cat.stopsignal, signal.SIGKILL)
        self.assertEqual(cat.stopwaitsecs, 5)
        self.assertEqual(cat.logfile_maxbytes, datatypes.byte_size('50MB'))
        self.assertEqual(cat.logfile_backups, 10)
        self.assertEqual(cat.exitcodes, [0,2])

        cat2 = options.programs[1]
        self.assertEqual(cat2.name, 'cat2')
        self.assertEqual(cat2.command, '/bin/cat')
        self.assertEqual(cat2.priority, 999)
        self.assertEqual(cat2.autostart, True)
        self.assertEqual(cat2.autorestart, False)
        self.assertEqual(cat2.uid, None)
        self.assertEqual(cat2.logfile, '/tmp/cat2.log')
        self.assertEqual(cat2.stopsignal, signal.SIGTERM)
        self.assertEqual(cat2.logfile_maxbytes, 1024)
        self.assertEqual(cat2.logfile_backups, 2)
        self.assertEqual(cat2.exitcodes, [0,2])

self.assertEqual(cat2.uid, None)
        self.assertEqual(cat2.logfile, '/tmp/cat2.log')
        self.assertEqual(cat2.stopsignal, signal.SIGTERM)
        self.assertEqual(cat2.logfile_maxbytes, 1024)
        self.assertEqual(cat2.logfile_backups, 2)
        self.assertEqual(cat2.exitcodes, [0,2])

        cat3 = options.programs[2]
        self.assertEqual(cat3.name, 'cat3')
        self.assertEqual(cat3.command, '/bin/cat')
        self.assertEqual(cat3.priority, 999)
        self.assertEqual(cat3.autostart, True)
        self.assertEqual(cat3.autorestart, True)
        self.assertEqual(cat3.uid, None)
        self.assertEqual(cat3.logfile, instance.AUTOMATIC)
        self.assertEqual(cat3.logfile_maxbytes, datatypes.byte_size('50MB'))
        self.assertEqual(cat3.logfile_backups, 10)
        self.assertEqual(cat3.exitcodes, [0,1,127])
        
        self.assertEqual(cat2.stopsignal, signal.SIGTERM)

        here = os.path.abspath(os.getcwd())
        self.assertEqual(instance.uid, 0)
        self.assertEqual(instance.gid, 0)
        self.assertEqual(instance.directory, '/tmp')
        self.assertEqual(instance.umask, 022)
        self.assertEqual(instance.logfile, os.path.join(here,'supervisord.log'))
        self.assertEqual(instance.logfile_maxbytes, 1000 * 1024 * 1024)
        self.assertEqual(instance.logfile_backups, 5)
        self.assertEqual(instance.loglevel, 40)
        self.assertEqual(instance.pidfile, os.path.join(here,'supervisord.pid'))
        self.assertEqual(instance.nodaemon, True)

def from_args(cls, *process_arguments):
        processes = dict()
        for process in process_arguments:
            name, limit = process.split('=')
            processes[name] = supervisor.datatypes.byte_size(limit)
        return cls(processes)

def parse_size(option, value):
    try:
        size = byte_size(value)
    except:
        print 'Unparseable byte_size in %r for %r' % (value, option)
        usage()
        
    return size

autorestart = auto_restart(get(section, 'autorestart', 'unexpected'))
        startsecs = integer(get(section, 'startsecs', 1))
        startretries = integer(get(section, 'startretries', 3))
        stopsignal = signal_number(get(section, 'stopsignal', 'TERM'))
        stopwaitsecs = integer(get(section, 'stopwaitsecs', 10))
        stopasgroup = boolean(get(section, 'stopasgroup', 'false'))
        killasgroup = boolean(get(section, 'killasgroup', stopasgroup))
        exitcodes = list_of_exitcodes(get(section, 'exitcodes', '0'))
        # see also redirect_stderr check in process_groups_from_parser()
        redirect_stderr = boolean(get(section, 'redirect_stderr','false'))
        numprocs = integer(get(section, 'numprocs', 1))
        numprocs_start = integer(get(section, 'numprocs_start', 0))
        environment_str = get(section, 'environment', '', do_expand=False)
        stdout_cmaxbytes = byte_size(get(section,'stdout_capture_maxbytes','0'))
        stdout_events = boolean(get(section, 'stdout_events_enabled','false'))
        stderr_cmaxbytes = byte_size(get(section,'stderr_capture_maxbytes','0'))
        stderr_events = boolean(get(section, 'stderr_events_enabled','false'))
        serverurl = get(section, 'serverurl', None)
        if serverurl and serverurl.strip().upper() == 'AUTO':
            serverurl = None

        # find uid from "user" option
        user = get(section, 'user', None)
        if user is None:
            uid = None
        else:
            uid = name_to_uid(user)

        umask = get(section, 'umask', None)
        if umask is not None:
            umask = octal_type(umask)

priority = integer(get(section, 'priority', 999))
        autostart = boolean(get(section, 'autostart', 'true'))
        autorestart = auto_restart(get(section, 'autorestart', 'unexpected'))
        startsecs = integer(get(section, 'startsecs', 1))
        startretries = integer(get(section, 'startretries', 3))
        stopsignal = signal_number(get(section, 'stopsignal', 'TERM'))
        stopwaitsecs = integer(get(section, 'stopwaitsecs', 10))
        stopasgroup = boolean(get(section, 'stopasgroup', 'false'))
        killasgroup = boolean(get(section, 'killasgroup', stopasgroup))
        exitcodes = list_of_exitcodes(get(section, 'exitcodes', '0'))
        # see also redirect_stderr check in process_groups_from_parser()
        redirect_stderr = boolean(get(section, 'redirect_stderr','false'))
        numprocs = integer(get(section, 'numprocs', 1))
        numprocs_start = integer(get(section, 'numprocs_start', 0))
        environment_str = get(section, 'environment', '', do_expand=False)
        stdout_cmaxbytes = byte_size(get(section,'stdout_capture_maxbytes','0'))
        stdout_events = boolean(get(section, 'stdout_events_enabled','false'))
        stderr_cmaxbytes = byte_size(get(section,'stderr_capture_maxbytes','0'))
        stderr_events = boolean(get(section, 'stderr_events_enabled','false'))
        serverurl = get(section, 'serverurl', None)
        if serverurl and serverurl.strip().upper() == 'AUTO':
            serverurl = None

        # find uid from "user" option
        user = get(section, 'user', None)
        if user is None:
            uid = None
        else:
            uid = name_to_uid(user)

        umask = get(section, 'umask', None)
        if umask is not None:

Options.__init__(self)
        self.configroot = Dummy()
        self.configroot.supervisord = Dummy()

        self.add(None, None, "v", "version", self.version)
        self.add("nodaemon", "supervisord.nodaemon", "n", "nodaemon", flag=1,
                 default=0)
        self.add("user", "supervisord.user", "u:", "user=")
        self.add("umask", "supervisord.umask", "m:", "umask=",
                 octal_type, default='022')
        self.add("directory", "supervisord.directory", "d:", "directory=",
                 existing_directory)
        self.add("logfile", "supervisord.logfile", "l:", "logfile=",
                 existing_dirpath, default="supervisord.log")
        self.add("logfile_maxbytes", "supervisord.logfile_maxbytes",
                 "y:", "logfile_maxbytes=", byte_size,
                 default=50 * 1024 * 1024) # 50MB
        self.add("logfile_backups", "supervisord.logfile_backups",
                 "z:", "logfile_backups=", integer, default=10)
        self.add("loglevel", "supervisord.loglevel", "e:", "loglevel=",
                 logging_level, default="info")
        self.add("pidfile", "supervisord.pidfile", "j:", "pidfile=",
                 existing_dirpath, default="supervisord.pid")
        self.add("identifier", "supervisord.identifier", "i:", "identifier=",
                 str, default="supervisor")
        self.add("childlogdir", "supervisord.childlogdir", "q:", "childlogdir=",
                 existing_directory, default=tempfile.gettempdir())
        self.add("minfds", "supervisord.minfds",
                 "a:", "minfds=", int, default=1024)
        self.add("minprocs", "supervisord.minprocs",
                 "", "minprocs=", int, default=200)
        self.add("nocleanup", "supervisord.nocleanup",

logfiles = {}

            for k in ('stdout', 'stderr'):
                n = '%s_logfile' % k
                lf_val = get(section, n, Automatic)
                if isinstance(lf_val, basestring):
                    lf_val = expand(lf_val, expansions, n)
                lf_val = logfile_name(lf_val)
                logfiles[n] = lf_val

                bu_key = '%s_logfile_backups' % k
                backups = integer(get(section, bu_key, 10))
                logfiles[bu_key] = backups

                mb_key = '%s_logfile_maxbytes' % k
                maxbytes = byte_size(get(section, mb_key, '50MB'))
                logfiles[mb_key] = maxbytes

                if lf_val is Automatic and not maxbytes:
                    self.parse_warnings.append(
                        'For [%s], AUTO logging used for %s without '
                        'rollover, set maxbytes > 0 to avoid filling up '
                        'filesystem unintentionally' % (section, n))

            if redirect_stderr:
                if logfiles['stderr_logfile'] not in (Automatic, None):
                    self.parse_warnings.append(
                        'For [%s], redirect_stderr=true but stderr_logfile has '
                        'also been set to a filename, the filename has been '
                        'ignored' % section)
                # never create an stderr logfile when redirected
                logfiles['stderr_logfile'] = None

kwargs['expansions'] = expansions
            return parser.getdefault(opt, default, **kwargs)

        section.minfds = integer(get('minfds', 1024))
        section.minprocs = integer(get('minprocs', 200))

        directory = get('directory', None)
        if directory is None:
            section.directory = None
        else:
            section.directory = existing_directory(directory)

        section.user = get('user', None)
        section.umask = octal_type(get('umask', '022'))
        section.logfile = existing_dirpath(get('logfile', 'supervisord.log'))
        section.logfile_maxbytes = byte_size(get('logfile_maxbytes', '50MB'))
        section.logfile_backups = integer(get('logfile_backups', 10))
        section.loglevel = logging_level(get('loglevel', 'info'))
        section.pidfile = existing_dirpath(get('pidfile', 'supervisord.pid'))
        section.identifier = get('identifier', 'supervisor')
        section.nodaemon = boolean(get('nodaemon', 'false'))

        tempdir = tempfile.gettempdir()
        section.childlogdir = existing_directory(get('childlogdir', tempdir))
        section.nocleanup = boolean(get('nocleanup', 'false'))
        section.strip_ansi = boolean(get('strip_ansi', 'false'))

        environ_str = get('environment', '')
        environ_str = expand(environ_str, expansions, 'environment')
        section.environment = dict_of_key_value_pairs(environ_str)
        # Process rpcinterface plugins before groups to allow custom events to
        # be registered.