合并保留所有项目pandas的数据帧

Question

如何合并两个不同的数据帧,在填充空白时保留每个数据帧的所有行？

DF1

Name     Addr      Num     Parent   Parent_Addr
Matt     123H      8       James    543F
Adam     213H      9       James    543F
James    321H      10      Mom      654F
Andrew   512F      10      Dad      665F
Faith    555A      7       None     657F

DF2

Name     Parent    Parent_Num  Parent_Addr
Matt     James     10          543F
Adam     James     10          543F
James    Mom       12          654F
None     Ian       13          656F
None     None      None        1234

预期产出

Name     Addr      Num     Parent   Parent_Num   Parent_Addr  
Matt     123H      8       James    10           543F
Adam     213H      9       James    10           543F
James    321H      10      Mom      12           654F
Andrew   512F      10      Dad      None         665F
Faith    555A      7       None     None         657F
None     None      None    Ian      13           656F
None     None      None    None     None         1234

我试图合并并保留两个数据帧的所有数据.任何帮助将不胜感激.谢谢.

Answer 1

您需要合并所有公共列并使用外部联接

pd.merge(df1, df2, on = ['Name', 'Parent', 'Parent_Addr'], how = 'outer')

    Name    Addr    Num Parent  Parent_Addr Parent_Num
0   Matt    123H    8   James   543F        10
1   Adam    213H    9   James   543F        10
2   James   321H    10  Mom     654F        12
3   Andrew  512F    10  Dad     665F        NaN
4   Faith   555A    7   None    657F        NaN
5   None    NaN     NaN Ian     656F        13
6   None    NaN     NaN None    1234        None