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中级

实现渠道对账本地流水对比渠道流水

未完成
中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    from pyodide.http import open_url
    account_types_csv = open_url(____).read()
    payment_channels_csv = open_url(____).read()
    accounts_csv = open_url(____).read()
    transfers_csv = open_url(____).read()
    clearing_batches_csv = open_url(____).read()
    channel_stats_csv = open_url(____).read()
    import sqlite3, pandas as pd
    from io import StringIO
    conn = sqlite3.connect(____)
    pd.read_csv(StringIO(____)).to_sql(____)
    pd.read_csv(StringIO(____)).to_sql(____)
    local = pd.read_sql_query(____)
    stats = pd.read_sql_query(____)
    merged = local.merge(____).fillna(____)
    merged['____'] = merged['____'] - merged['____']
    print(merged.to_string(____))
    conn.close()

示例

输入
solve()
期望输出
channel_id  local_count  stats_count  diff
          1            2           27   -25
          2            4           59   -55
          5            4            5    -1
          6            2           18   -16
          7            1           15   -14
          8            1           42   -41
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