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

---
id: 5e9a093a74c4063ca6f7c15f
title: Data Cleaning Duplicates
challengeType: 11
isHidden: false
videoId: kj7QqjXhH6A
---

## Description
<section id='description'>
</section>

## Tests
<section id='tests'>

```yml
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.
    - contain a duplicate, where the value for the row is at least the second occurrence of that value.
    - contain a duplicate, where the value for the row contains either the first or second occurrence.
  solution: 2
```

</section>