[英]Merge two Dataframes based on a similar column from the First dataframe?
[英]Merge two dataframes if data of a column in first dataframe exists in any of the columns of another dataframe in python
我有两个需要合并的数据框。 第一个是:
page value
shoes 554
sneakers 226
sandals 114
boots 821
T-shirt 213
mobile-phone 284
laptop 361
第二个数据框是:
path1 path2 path3 path4
fashion footwear shoes-and-other shoes
fashion footwear shoes-and-other sneakers
fashion footwear sandals NaN
fashion footwear shirts T-shirt
electronic devices mobile-and-tablet mobile-phone
electronic devices laptop NaN
我预期的 output 将是:
path1 path2 path3 path4 page value
fashion footwear shoes-and-other shoes shoes 554
fashion footwear shoes-and-other sneakers sneakers 226
fashion footwear sandals NaN sandals 114
fashion footwear shirts T-shirt T-shirt 213
electronic devices mobile-and-tablet mobile-phone mobile-phone 284
electronic devices laptop NaN laptop 361
如果第一个数据帧中的任何page
字符串存在于第二个数据帧的path1
或path2
或path3
或path4
列中,我想加入这两个数据帧。 请注意,第一个数据帧的page
可能与第二个数据帧的path1
匹配,我有多种情况。
有没有简单的pythonic方式?
让我们尝试使用ffill
where
创建合并键,然后merge
df1['page'] = df1.where(df1.isin(df.page.tolist())).ffill(1).iloc[:,-1]
df1 = df1.merge(df, how='left')
df1
Out[131]:
path1 path2 path3 path4 page value
0 fashion footwear shoes-and-other shoes shoes 554
1 fashion footwear shoes-and-other sneakers sneakers 226
2 fashion footwear sandals NaN sandals 114
3 fashion footwear shirts T-shirt T-shirt 213
4 electronic devices mobile-and-tablet mobile-phone mobile-phone 284
5 electronic devices laptop NaN laptop 361
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