human
Solve the following python programming problem given the following code:
def parse_options(args) : 
    parser = optparse.OptionParser (usage = '%prog [options] task1 [[task2] ...]', version = ('%prog ' + __version__)) 
    def error(msg) : 
        raise CommandLineUsageException ((parser.get_usage () + parser.format_option_help ()), msg) 
parser.error = error 
    list_tasks_option = parser.add_option ('-t', '--list-tasks', action = 'store_true', dest = 'list_tasks', default = False, help = 'List tasks') 
    list_plan_tasks_option = parser.add_option ('-T', '--list-plan-tasks', action = 'store_true', dest = 'list_plan_tasks', default = False, help = 'List execution plan tasks') 
    start_project_option = parser.add_option ('--start-project', action = 'store_true', dest = 'start_project', default = False, help = 'Initialize build descriptors and python project structure') 
    update_project_option = parser.add_option ('--update-project', action = 'store_true', dest = 'update_project', default = False, help = 'Update build descriptors and python project structure') 
    parser.add_option ('-v', '--verbose', action = 'store_true', dest = 'verbose', default = False, help = 'Enable verbose output') 
    project_group = optparse.OptionGroup (parser, 'Project Options', 'Customizes the project to build.') 
    project_group.add_option ('-D', '--project-directory', dest = 'project_directory', help = 'Root directory to execute in', metavar = '<project directory>', default = '.') 
    project_group.add_option ('-E', '--environment', dest = 'environments', help = 'Activate the given environment for this build. Can be used multiple times', metavar = '<environment>', action = 'append', default = []) 
    project_group.add_option ('-P', action = 'append', dest = 'property_overrides', default = [], metavar = '<property>=<value>', help = 'Set/ override a property value') 
    project_group.add_option ('-x', '--exclude', action = 'append', dest = 'exclude_optional_tasks', default = [], metavar = '<task>', help = 'Exclude optional task dependencies') 
    project_group.add_option ('-o',...
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
update_project_option