path1_2.py

## Part 1

from __future__ import annotations

from pathlib import Path


def calculate_max_calories(input: str) -> int | str:
    """
    Calculates the max number of calories in a given input file. Calories are int's.
    """
    max_calories: float = float("-inf")
    current_calories: int = 0
    path = Path(input)

    if path.exists():
        with path.open(mode="r") as file:
            for line in file:
                if line != "\n":
                    current_calories += int(line)
                else:
                    max_calories = max(current_calories, max_calories)
                    current_calories = 0
            return max_calories
    return "File does not exist"


print(calculate_max_calories("input.txt"))

## Part 2

def calculate_max_calories(input: str) -> int | str:
    """
    Calculates the top 3 max number of calories in a given input file. Calories are int's.
    """
    all_calories: list[int] = []
    current_calories: int = 0
    path = Path(input)

    if path.exists():
        with path.open(mode="r") as file:
            for line in file:
                if line != "\n":
                    current_calories += int(line)
                else:
                    all_calories.append(current_calories)
                    current_calories = 0
            all_calories.sort(reverse=True)
            return sum(all_calories[:3])
    return "File does not exist"


print(calculate_max_calories("input.txt"))