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freeCodeCamp/curriculum/challenges/chinese-traditional/08-data-analysis-with-python/numpy/accessing-and-changing-elements,-rows,-columns.md

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---
id: 5e9a0a8e09c5df3cc3600ed4
title: '訪問與更改元素、行和列'
challengeType: 11
videoId: v-7Y7koJ_N0
bilibiliIds:
aid: 590517748
bvid: BV1Eq4y1f7Fa
cid: 409025392
dashedName: accessing-and-changing-elements-rows-columns
---
# --question--
## --text--
以下哪行代碼將下面的 Numpy 數組的第三行的數值都更改成 20
```py
a = np.array([[1, 2, 3, 4, 5], [6, 7, 8, 9, 10]])
# Output:
# [[ 1 2 20 4 5]
# [ 6 7 20 9 10]]
```
## --answers--
```python
a[:, 3] = 20
```
---
```python
a[2, :] = 20
```
---
```python
a[:, 2] = 20
```
---
```python
a[1, 2] = 20
```
## --video-solution--
3