--- 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?
      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
## --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