Source code for kyu_6.default_list.default_list

#  Created by Egor Kostan.
#  GitHub: https://github.com/ikostan
#  LinkedIn: https://www.linkedin.com/in/egor-kostan/


class DefaultList:

    def __init__(self, lst: list, default_value: str):
        # The class will have two parameters to be given:
        # a list, and a default value.
        self.__lst: list = lst
        self.__default_value: str = default_value

    def __getitem__(self, i: int):
        """
        The default value will be returned any time an index of the list
        is called in the code that would normally raise an error:
        (i.e. i > len(list) - 1 or i < -len(list)).
        :param i:
        :return:
        """
        if i >= len(self.__lst) or i < -len(self.__lst):
            return self.__default_value
        return self.__lst[i]

    def extend(self, items: list) -> None:
        """
        This class must also support the regular list functions: extend.
        :param items: iterable
        :return:
        """
        self.__lst.extend(items)

    def append(self, item) -> None:
        """
        This class must also support the regular list functions: append.
        :param item:
        :return:
        """
        self.__lst.append(item)

    def pop(self, item):
        """
        This class must also support the regular list functions: pop.
        :param item:
        :return:
        """
        return self.__lst.pop(item)

    def remove(self, item) -> None:
        """
        This class must also support the regular list functions: remove.
        :param item:
        :return:
        """
        self.__lst.remove(item)

    def insert(self, index: int, item) -> None:
        """
        This class must also support the regular list functions: insert.
        :param index:
        :param item:
        :return:
        """
        self.__lst.insert(index, item)