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📜  groupby - Python 代码示例

📅  最后修改于: 2022-03-11 14:46:13.926000             🧑  作者: Mango

代码示例1
df['frequency'] = df['county'].map(df['county'].value_counts())

    county  frequency
1   N       5
2   N       5
3   C       1
4   N       5
5   S       1
6   N       5
7   N       5