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  • DataFrame-选择与切片

    取得DataFrame对象reviews的description列的前10个值(或者说reviews前10行的description列):

    reviews.iloc[:10].loc[:,'description'] 等价于 reviews[:10]['description']

    kaggles练习(https://www.kaggle.com/morein2008/indexing-selecting-assigning/edit)答案:

    reviews.loc[reviews['country'].isin(['Italy','France']) & (reviews['points']>=90),['country','points']]
    reviews.loc[reviews['country']=='Italy']['points']
    reviews.iloc[:-1000:-1]['points']
    reviews.iloc[:1000]['points']
    reviews['points']
    check_q9(reviews.loc[reviews['region_2'].isnull()==False,])
    check_q8(reviews.loc[reviews['country']=='Italy',])
    check_q7(reviews.iloc[:100,][['country','variety']])
    check_q6(reviews.iloc[[0,1,10,100],][['country','province','region_1','region_2']])
    check_q5(reviews.iloc[[1,2,3,5,8],])
    check_q4(reviews.iloc[:10,].loc[:,'description'])
    check_q3(reviews.iloc[0])
    check_q2(reviews['description'][0])
    check_q1(reviews['description'])

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  • 原文地址:https://www.cnblogs.com/aaronhoo/p/9508902.html
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