freeCodeCamp/curriculum/challenges/chinese/08-data-analysis-with-python/data-analysis-with-python-course/data-cleaning-duplicates.md

id, challengeType, videoId

id	challengeType	videoId
5e9a093a74c4063ca6f7c15f	11	kj7QqjXhH6A

--description--

More resources:

- Notebook

--question--

--text--

The Python method .duplicated() returns a boolean Series for your DataFrame. True is the return value for rows that:

--answers--

contain a duplicate, where the value for the row contains the first occurrence of that value.

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contain a duplicate, where the value for the row is at least the second occurrence of that value.

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contain a duplicate, where the value for the row contains either the first or second occurrence.

--video-solution--

2

--hints--

--solutions--