实现取款操作（余额不足回滚）

def solve():
    from pyodide.http import open_url
    customers_csv = open_url(____).read()
    accounts_csv = open_url(____).read()
    cards_csv = open_url(____).read()
    import sqlite3
    import pandas as pd
    from io import StringIO

    conn = sqlite3.connect(____)
    pd.read_csv(StringIO(____)).to_sql(____)

    def withdraw(____):
        try:
            cur = conn.cursor()
            row = cur.execute("____", (____)).fetchone()
            if row[____] < amount:
                raise ValueError(____)
            new_bal = row[____] - amount
            cur.execute("____", (____))
            conn.commit()
            print(____)
        except ValueError as e:
            conn.rollback()
            print(____)

    withdraw(____)
    withdraw(____)
    conn.close()