英文:
Dataframe fill up a column values by finding the occurence of an other one in an other Dataframe
问题
如您可能已经理解的，我的问题非常具体...
所以我有两个数据框，其中一个列可以被视为“中心”列。
这个中心列的所有值都是唯一的。
我们的目标是向第一个数据框添加一个新列，其中包含第二个数据框中某一列的值。
这是我目前尝试的内容，不幸的是它没有成功 :/
df1['NewColumn'] = '0' #我创建了第一列并设置了默认值
df1.loc[df2['PivotCol'] == df1['PivotCol'], 'NewColumn'] = df2.loc[df2['PivotCol'] == df1['PivotCol'], 'ColumnToMergeTo1stDataframe'].iloc[0]
NewColumn是在df1中新创建的列，它将包含df2中的ColumnToMergeTo1stDataframe的值...
我希望我的问题清楚，如果不清楚，请随时提问。
最后但并非最不重要，对于糟糕的英语，我表示抱歉 
英文:
As you may have understood, my question is quite specific...
So I have 2 dataframes with a column which could be seen as a "Pivot" column.
All the values of this Pivot column are unique.
Our goal is to add a new column to the first Dataframe containing the value of a column in the second one.
This is what I tried for now, it unfortunately didn't work :/
df1['NewColumn] = '0' //I created the first column and set a default value
df1.loc[df2['PivotCol'] == df1['PivotCol'], 'NewColumn'] = df2.loc[df2['PivotCol'] == df['PivotCol'], 'ColumnToMergeTo1stDataframe'].iloc[0]
NewColumn is the newly created column in df1 which will be containing the value of ColumnToMergeTo1stDataframe which is in the df2...
I hope that my problem is clear, don't hesitate to ask questions if it was not.
Last but not least, sorry for bad english
答案1
得分: 0
A panda merge made the job :)
英文:
df = pd.merge(df1, df2[['Col Pivot', 'Col to Merge']], on='Col Pivot', how='left')
A panda merge made the job
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