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Pandas: Issue with merging DataFrames based on index and multiple columns, resulting in unexpected NaN values

👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-12
pandas dataframe merge

I'm encountering an issue while trying to merge two DataFrames in pandas based on the index and additional columns. I have two DataFrames, `df1` and `df2`, and ...