63 lines
1.6 KiB
Markdown
63 lines
1.6 KiB
Markdown
---
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id: 5e9a093a74c4063ca6f7c15c
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title: Pandas 创建列
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challengeType: 11
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videoId: _sSo2XZoB3E
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bilibiliIds:
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aid: 975568901
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bvid: BV1b44y1b7Cg
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cid: 409018052
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dashedName: pandas-creating-columns
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---
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# --description--
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*在视频中我们使用的编辑器工具是在 notebook.ai 这个平台，你也可以选择用其他的平台，比如说 Google Colab 也是一个不错的选择。*
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以下有更多的资料：
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- [在 GitHub 平台的 Notebooks](https://github.com/ine-rmotr-curriculum/freecodecamp-intro-to-pandas)
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- [如何使用 Google Colab 来打开 GitHub 上的 Notebooks](https://colab.research.google.com/github/googlecolab/colabtools/blob/master/notebooks/colab-github-demo.ipynb)
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# --question--
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## --text--
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哪段代码可以向 DataFrame `certificates_earned` 中添加一个 “Certificates per month” 列，就像下面所展示的？
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<pre> Certificates Time (in months) Certificates per month
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Tom 8 16 0.50
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Kris 2 5 0.40
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Ahmad 5 9 0.56
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Beau 6 12 0.50</pre>
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## --answers--
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```py
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certificates_earned['Certificates'] /
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certificates_earned['Time (in months)']
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```
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---
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```py
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certificates_earned['Certificates per month'] = round(
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certificates_earned['Certificates'] /
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certificates_earned['Time (in months)']
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)
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```
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---
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```py
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certificates_earned['Certificates per month'] = round(
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certificates_earned['Certificates'] /
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certificates_earned['Time (in months)'], 2
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)
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```
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## --video-solution--
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3
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