Python/Lesson11/Lesson11_51.py - master - Nick_Wern/SUSU

Python/Lesson11/Lesson11_51.py
104 строки3 KB
Nick_Wern
Добавлены работы по дисциплине Программирование на Python
03 май 2026, 19:26
03 май 2026, 19:26913d1bd
import json
import csv
from typing import List, Dict, Any

def load_orders(path: str) -> List[Dict[str, Any]]:
    try:
        with open(path, 'r', encoding='utf-8') as f:
            return json.load(f)
    except (json.JSONDecodeError, FileNotFoundError):
        return []

def save_orders(orders: List[Dict[str, Any]], path: str) -> None:
    with open(path, 'w', encoding='utf-8') as f:
        json.dump(orders, f, indent=2, ensure_ascii=False)

def clear_orders(path: str) -> None:
    try:
        with open(path, 'w', encoding='utf-8') as f:
            f.write("")
    except:
        None

def add_order(order: dict, path: str) -> None:
    try:
        required_fields = ["id", "product", "quantity", "price"]
        for field in required_fields:
            if field not in order:
                raise ValueError(f"Отсутствует обязательное поле: {field}")

        if not isinstance(order["id"], int):
            raise TypeError("Поле 'id' должно быть целым числом")
        if not isinstance(order["product"], str):
            raise TypeError("Поле 'product' должно быть строкой")
        if not isinstance(order["quantity"], int):
            raise TypeError("Поле 'quantity' должно быть целым числом")
        if not isinstance(order["price"], (int, float)):
            raise TypeError("Поле 'price' должно быть числом")

        if order["quantity"] <= 0:
            raise ValueError("Количество должно быть положительным числом")
        if order["price"] <= 0:
            raise ValueError("Цена должна быть положительным числом")


        orders = load_orders(path)
        order_ids = [ o["id"] for o in orders ]
        if order["id"] in order_ids:
            raise ValueError(f"Заказ с ID {order['id']} уже существует")

        orders.append(order)
        save_orders(orders, path)
        print(f"Заказ с ID {order['id']} успешно добавлен")

    except (ValueError, TypeError) as e:
        print(f"Ошибка: {e}")

def export_orders_to_csv(json_path: str, path: str) -> None:
    orders = load_orders(json_path)

    if not orders:
        print("Нет заказов для экспорта")
        return

    fieldnames = ["id", "product", "quantity", "price", "total"]

    with open(path, 'w', encoding='utf-8', newline='') as f:
        writer = csv.DictWriter(f, fieldnames=fieldnames)
        writer.writeheader()

        for order in orders:
            row = order.copy()
            row["total"] = row["quantity"] * row["price"]
            row = {key: str(value) for key, value in row.items()}
            writer.writerow(row)

    print(f"Экспортировано {len(orders)} заказов в {path}")

def main():
    clear_orders("orders.json")

    add_order({
        "id": 1,
        "product": "Ноутбук",
        "quantity": 2,
        "price": 45000.5
    }, "orders.json")

    add_order({
        "id": 2,
        "product": "Мышь",
        "quantity": 5,
        "price": 1500.75
    }, "orders.json")

    add_order({
        "id": 3,
        "product": "Клавиатура",
        "quantity": 3,
        "price": 3200
    }, "orders.json")

    export_orders_to_csv("orders.json", "orders.csv")

main()