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`.sort_values()`
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`.sort_values()`でいったん日付順に並べ替えた後に`.drop_duplicates(～ keep='last')`でできます。
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参考：[How do I drop duplicates and keep the last timestamp on pandas](https://stackoverflow.com/questions/49425727/how-do-i-drop-duplicates-and-keep-the-last-timestamp-on-pandas)
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