[英]How to join data frames with keeping only matching ones?
I have two dataframes:我有两个数据框:
id value
a1 12
a2 15
a3 17
id value1
a1 22
a2 58
a7 10
I want to join them by column id keeping only matching one:我想通过列 id 加入它们,只保留匹配的一个:
id value value1
a1 12 22
a2 15 58
How to do that?怎么做? I tried pd.merge but it keeps all id
我试过 pd.merge 但它保留了所有 id
You can use pd.merge
and inner
:您可以使用
pd.merge
和inner
:
Example of dataframe数据框示例
df1 = pd.DataFrame({'id':['a1','a2', 'a3'],
'value':[12, 15, 17]})
df2 = pd.DataFrame({'id':['a1','a2', 'a7'],
'value':[22, 58, 10]})
code代码
merged_df = df1.merge(df2, how = 'inner', on = ['id'])
merged_df.columns = ["id", "value", "value1"]
Result结果
id value value1
0 a1 12 22
1 a2 15 58
If you want to change index as id , you can use pd.set_index('id')
如果要将 index 更改为id ,可以使用
pd.set_index('id')
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