I'm new to python (background in T-SQL and R) and looking for a set-based method for adding a calculated column to a Pandas Dataframe. R and T-SQL have simple implementations for this concept, but I've yet to find a solution to this in Python.I'm new to python (background in T-SQL and R) a
阅读背景：
如何使用基于集合的逻辑将计算列添加到pandas数据框？
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