Pandas boolean DataFrame selection
Dataframe filtering rows by column values
filter-rows-based-on-column-values-with-query-function-in-pandas/
how-to-subset-pandas-dataframe-based-on-values-of-a-column/
pandas.DataFrame.query
v[v.市.eq('石家庄') | v.市.eq('天津') | v.市.eq('衡水')]
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