import os
from abc import ABC
from collections import Iterator
from typing import Generator, Any


class BaseAssignment(ABC):
    def __init__(self, path):
        self.path = path

    def parse_item(self, item: str) -> Any:
        return item

    def read_input(self, example = False) -> Generator:
        file = f'{self.path}/input.txt'
        if example or not os.path.isfile(file):
            file = f'{self.path}/example.txt'

        with open(file, 'r') as input_file:
            for line in input_file.readlines():
                yield self.parse_item(line.strip())

    def run(self, input: Iterator) -> Any:
        raise NotImplementedError('Please implement run')