freeCodeCamp/curriculum/challenges/english/08-data-analysis-with-python/numpy/copying-arrays-warning.english.md

---
id: 5e9a0a8e09c5df3cc3600ed7
title: Copying Arrays Warning
challengeType: 11
isHidden: false
videoId: iIoQ0_L0GvA
---

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

## Tests
<section id='tests'>

```yml
question:
  text: |
    What is the value of `a` after running the following code?:

    ```py
    import numpy as np

    a = np.array([1, 2, 3, 4, 5])
    b = a
    b[2] = 20
    ```

  answers:
    - |
      `[1 2 3 4 5]`
    - |
      `[1 2 20 4 5]`
    - |
      `[1 20 3 4 5]`
  solution: 2
```

</section>