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  • 差集交集

    两个df对象,要获取这两个df对象的交集和差集
    取交集
    inner_df = pd.merge(df1, df2, how='inner') ## 计算df1=df2的部份

    left_df = pd.merge(df1, df2, how='left') ## df1部分

    right_df = pd.merge(df1, df2, how='right') ## df2部分

    outer_df = pd.merge(df1, df2, how='outer') ## 取合集:df1和df2所有数据的集合

    取差集
    利用了drop_duplicates
    df1-df2
    df = pd.concat([df1, df2, df2]).drop_duplicates(subset=['filed_name', 'filed_type'], keep=False)
    df2-df1
    df = pd.concat([df2, df1, df1]).drop_duplicates(subset=['filed_name', 'filed_type'], keep=False)

    等同于
    fileds_df = df1.append(df2).drop_duplicates(subset=['filed_name', 'filed_type'], keep=False)
    fileds_df = df2.append(df1).drop_duplicates(subset=['filed_name', 'filed_type'], keep=False)

    取df2跟df1不同的数据,采用merge指定列明进行聚合,聚合完成之后可以检查出df2中不同的数据,再查找出不同数据
    merge_df = pd.merge(left=df1, right=df2, how='right', indicator=True, on=['column1','column2'])
    diff_df = merge_df.loc[merge_df._merge == 'right_only', :]

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  • 原文地址:https://www.cnblogs.com/cizao/p/14248169.html
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