default set to False, help containing string 'Mark migrations as run without actually running them' as arguments. call the method parser.add_argument with string '--list', string '-l', action contains string 'store_true', dest set to string 'list',
parser . add_argument ( '--list' , '-l' , action = 'store_true' , dest = 'list' , default = False , help = 'Show a list of all known migrations and which are applied' )