core.py

import json
from typing import Any, Dict, List


def load_json(file_path: str) -> Dict[str, Any]:
    """Load a JSON file and return its contents as a dictionary."""
    with open(file_path, 'r', encoding='utf-8') as file:
        return json.load(file)


def save_json(file_path: str, data: Dict[str, Any]) -> None:
    """Save a dictionary as a JSON file."""
    with open(file_path, 'w', encoding='utf-8') as file:
        json.dump(data, file, ensure_ascii=False, indent=4)


def flatten_list(nested_list: List[List[Any]]) -> List[Any]:
    """Flatten a nested list into a single list."""
    return [item for sublist in nested_list for item in sublist]


def merge_dictionaries(dicts: List[Dict[str, Any]]) -> Dict[str, Any]:
    """Merge multiple dictionaries into one, with later values overwriting earlier ones."""
    result = {}
    for d in dicts:
        result.update(d)
    return result


def get_unique_elements(seq: List[Any]) -> List[Any]:
    """Return a list of unique elements, preserving the original order."""
    seen = set()
    return [x for x in seq if not (x in seen or seen.add(x))]