class Args:
    def __init__(self, argv):
        self.__argv = argv


    def get_positional(self, index):
        if len(self.__argv) > index:
            return self.__argv[index]
        return None


    def get_named(self, name, index, nr_args):
        found_name = False
        values = []

        for s in self.__argv:
            if found_name:
                if len(values) < nr_args:
                    values.append(s)
                    continue
                else:
                    break

            if s == '--{}'.format(name):
                if index > 0:
                    index -= 1
                    continue

                found_name = True
                continue

        if nr_args == 0:
            return found_name

        if len(values) < nr_args or not found_name:
            return None

        if len(values) == 1:
            return values[0]

        return values