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中级

查询转账网络关系

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中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    from pyodide.http import open_url
    customers_csv = open_url(____).read()
    accounts_csv = open_url(____).read()
    cards_csv = open_url(____).read()
    transactions_csv = open_url(____).read()
    transfers_csv = open_url(____).read()
    import sqlite3
    import pandas as pd
    from io import StringIO

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

    result = pd.read_sql_query(____)
    print(result.to_string(____))
    conn.close()

示例

输入
solve()
期望输出
from_account_no    to_account_no  amount          created_at
6217001000000003 6217001000000001 10000.0 2025-04-03 10:18:00
6217001000000001 6217001000000005  2000.0 2025-04-08 11:00:00
6217001000000006 6217001000000009 25000.0 2025-04-10 09:30:00
6217001000000009 6217001000000003  5000.0 2025-04-12 15:00:00
6217001000000004 6217001000000006 30000.0 2025-04-18 10:00:00
6217001000000006 6217001000000001  3500.0 2025-04-20 16:00:00
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