pandas映射问题
使用案例1import pandas as pddf = pd.DataFrame({'key1' : ['a', 'a', 'b', 'b', 'a'], 'key2' : ['one', 'two', 'one', 'two', 'one'], 'data1' : np.arange(5), 'data2' : np.arange(5,10)})print(df)df['data1'
