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Concatenating rows with duplicated indexes

Pandas is proving quite useful for your data prep! One small problem - your colleague reloaded the data frames without setting GameKey as the index for either frame. Can you still concatenate the games_2016 and games_2017 data frames?

निर्देश

100 XP

View the indexes of the reloaded data frames.
Rejoin the data frames using pd.concat().
View the new data frame.

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