The problem: let us take Titanic dataset from Kaggle. I have dataframe with columns "Pclass", "Sex" and "Age". I need to fill NaN in column "Age" with a median for certain group. If it is a woman from 1st class, I would like to fill her age with the median for 1st class women, not with the median for whole Age column.The problem: let us take Titanic dataset from K
阅读背景：
如何使用Python Pandas在特定切片中制作一片DataFrame和“fillna”？
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