def __init__(self, arg, argv):
self.arg = arg<EOL>self.argv = deque(argv[<NUM_LIT:1>:])<EOL>
Creates new Parser instance.

        First element of :argv: should be irrelevant (e.g. apps' name),
        because it will be stripped off.

        :arg: Arg instance.
        :argv: A list from which to get arguments.