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10个内置在 Pandas 中却常被忽略的向量化操作
Pandas 代码写得越多,越容易陷入一种惯性:用 apply() 逐行处理,用循环拼接结果,用 groupby 加 merge 绕一大圈完成本可以一行解决的操作。代码能跑结果正确,但行数膨胀、性能也大打折扣,审查时也让人读得费力。 Pandas 本身内置了大量面向列操作的方法 ...
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