实用技巧

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import pandas as pd


    

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data = pd.DataFrame({'A':[1,2,3], 'B':[4,5,6], 'C':[7,8,9]})
data


    

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data.columns = ['a', 'b', 'c']
data


    

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data.rename(columns={'a':'aa', 'b':'bb', 'c':'cc'}, inplace=True)
data


    

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data.loc[data.aa > 2, 'bb'] = '66'
data


    

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data['aa'] = data['aa'].map(lambda x: x*10)
data