合並同一行的數據框

Question

I have a python code that gets links from a dataframe (df1), collect data from a website and return output in a new dataframe

df1：

id   Name      link             Country        Continent  
1    Company1  www.link1.com    France         Europe
2    Company2  www.link2.com    France         Europe
3    Company3  www.Link3.com    France         Europe

代碼的輸出是 df2：

link           numberOfPPL      City  
www.link1.com       8            Paris
www.link1.com       9            Paris
www.link2.com       15           Paris
www.link2.com       1            Paris

我想將這兩個數據框合二為一（dfinal）。 我的代碼：

dfinal = df1.append(df2, ignore_index=True)

我得到了 dfinal：

    link           numberOfPPL      City       id   Name     Country  Continent
   www.link1.com       8            Paris
   www.link1.com       9            Paris
   www.link2.com       15           Paris
   www.link2.com       1            Paris
   www.link1.com                               1    Company1  France   Continent
   ..
   ..

我希望我的最終 dataframe 是這樣的：

    link           numberOfPPL      City       id   Name     Country  Continent
   www.link1.com       8            Paris      1    Company1  France  Europe
   www.link1.com       9            Paris      1    Company1  France  Europe
   www.link2.com       15           Paris      1    Company1  France  Europe
   www.link2.com       1            Paris      2    Company2  France  Europe

有人可以幫忙嗎？？

Answer 1

您可以在“鏈接”上合並兩個數據框：

outputDF = df2.merge(df1, how='left', on=['link'])