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---
id: 5e9a093a74c4063ca6f7c15c
title: Pandas 創建列
challengeType: 11
videoId: _sSo2XZoB3E
bilibiliIds:
aid: 975568901
bvid: BV1b44y1b7Cg
cid: 409018052
dashedName: pandas-creating-columns
---
# --description--
*在視頻中我們使用的編輯器工具是在 notebook.ai 這個平臺,你也可以選擇用其他的平臺,比如說 Google Colab 也是一個不錯的選擇。*
以下有更多的資料:
- [在 GitHub 平臺的 Notebooks](https://github.com/ine-rmotr-curriculum/freecodecamp-intro-to-pandas)
- [如何使用 Google Colab 來打開 GitHub 上的 Notebooks](https://colab.research.google.com/github/googlecolab/colabtools/blob/master/notebooks/colab-github-demo.ipynb)
# --question--
## --text--
哪段代碼可以向 DataFrame `certificates_earned` 中添加一個 “Certificates per month” 列,就像下面所展示的?
<pre> Certificates Time (in months) Certificates per month
Tom 8 16 0.50
Kris 2 5 0.40
Ahmad 5 9 0.56
Beau 6 12 0.50</pre>
## --answers--
```py
certificates_earned['Certificates'] /
certificates_earned['Time (in months)']
```
---
```py
certificates_earned['Certificates per month'] = round(
certificates_earned['Certificates'] /
certificates_earned['Time (in months)']
)
```
---
```py
certificates_earned['Certificates per month'] = round(
certificates_earned['Certificates'] /
certificates_earned['Time (in months)'], 2
)
```
## --video-solution--
3