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zcsnbb
V2EX  ›  Python

pandas 如何将某一列大于 0 的数字全部置为 1

  •  
  •   zcsnbb · Sep 28, 2018 · 4630 views
    This topic created in 2812 days ago, the information mentioned may be changed or developed.

    date rtn 0 2016-01-01 0.101536 1 2016-01-02 0.055109 2 2016-01-03 -0.163625 3 2016-01-04 0.086756 4 2016-01-05 0.035907 5 2016-01-06 0.047619 6 2016-01-07 0.018717 7 2016-01-08 -0.036290

    这样子的 df

    大佬帮帮忙,实在搞不出来了

    6 replies    2018-09-29 15:32:59 +08:00
    neosfung
        1
    neosfung  
       Sep 28, 2018
    df['rtn'] = df['rtn'].apply(lambda x: 1 if x>0 else x)
    jswangjieda
        2
    jswangjieda  
       Sep 28, 2018
    df.loc[df['rtn']>0,'rtn']=1
    ddzzhen
        3
    ddzzhen  
       Sep 28, 2018 via Android
    直接改为 true,false 矩阵
    lieh222
        4
    lieh222  
       Sep 29, 2018
    x = x**0
    lieh222
        5
    lieh222  
       Sep 29, 2018
    @lieh222 写错,请忽略。。。
    LaFayette
        6
    LaFayette  
       Sep 29, 2018
    df['rtn'] = np.where(df['rtn']>0, 1, df['rtn'])
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