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# -*- coding: utf-8 -*-
import os
from abc import ABC
from typing import Generator, Any, Iterator


class BaseAssignment(ABC):
    example_result = NotImplemented

    def __init__(self, path):
        self.path = path

    def __str__(self):
        return f"{self.__module__}.{self.__class__.__name__}"

    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")