当简单的 `sum`、`mean` 不够用，而你又不想把逻辑拆成很多中间表时，`GroupBy` 和 `apply` 是最常用的进阶入口。 - 能用 `agg ...
The raft of mortgage rate and proposition changes have continued, with the likes of NatWest, TSB, Coventry Building Society and Santander adjusting products. NatWest has increased rates by as much as ...
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