custom_list.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-"


class Nums(object):
    def __init__(self, num):
        self.elems = list(range(num))

    def __getitem__(self, sliced):
        return self.elems[sliced]

    def append(self, item):
        self.elems.append(item)

    def remove(self, item):
        self.elems.remove(item)

    def insert(self, pos, item):
        self.elems.insert(pos, item)

    def __len__(self):
        return len(self.elems)

    def __iter__(self):
        return iter(self.elems)

    def __repr__(self):
        return str(self.elems)


def main():
    n = Nums(20)
    print(n[2:5])
    print(n)

    for i in n:
        print(i)

    n.append(23)
    n.insert(1, -110)

    print(n)


if __name__ == '__main__':
    main()