统计各类别商品库存总量

def solve():
    from pyodide.http import open_url
    users_csv = open_url("https://data.zuihe.com/dbd/ecommerce/state_A00/users.csv").read()
    categories_csv = open_url("https://data.zuihe.com/dbd/ecommerce/state_A00/categories.csv").read()
    products_csv = open_url("https://data.zuihe.com/dbd/ecommerce/state_A00/products.csv").read()
    import sqlite3
    import pandas as pd
    from io import StringIO

    conn = sqlite3.connect(':memory:')
    pd.read_csv(StringIO(products_csv)).to_sql('products', conn, index=False, if_exists='replace')
    pd.read_csv(StringIO(categories_csv)).to_sql('categories', conn, index=False, if_exists='replace')

    result = pd.read_sql_query("""
        SELECT top_cat.name AS category, SUM(p.stock) AS total_stock
        FROM products p
        JOIN categories sub ON p.category_id = sub.id
        JOIN categories top_cat ON sub.parent_id = top_cat.id
        GROUP BY top_cat.id, top_cat.name
        ORDER BY total_stock DESC
    """, conn)
    print(result.to_string(index=False))
    conn.close()