75 lines
1.2 KiB
Markdown
75 lines
1.2 KiB
Markdown
---
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id: 5e9a093a74c4063ca6f7c15e
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title: DataFrames 中的數據清理
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challengeType: 11
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videoId: sTMN_pdI6S0
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bilibiliIds:
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aid: 505597026
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bvid: BV1Yg411c7bx
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cid: 409018948
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dashedName: data-cleaning-with-dataframes
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---
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# --description--
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*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。*
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以下有更多的資料：
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- [在 GitHub 平臺的 Notebooks](https://github.com/ine-rmotr-curriculum/data-cleaning-rmotr-freecodecamp)
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- [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)
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# --question--
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## --text--
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以下代碼會打印出什麼？
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```py
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import pandas as pd
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import numpy as np
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s = pd.Series([np.nan, 1, 2, np.nan, 3])
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s = s.fillna(method='ffill')
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print(s)
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```
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## --answers--
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<pre>
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0 1.0
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1 1.0
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2 2.0
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3 3.0
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4 3.0
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dtype: float64
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</pre>
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---
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<pre>
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0 NaN
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1 1.0
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2 2.0
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3 2.0
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4 3.0
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dtype: float64
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</pre>
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---
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<pre>
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0 NaN
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1 1.0
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2 2.0
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3 NaN
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4 3.0
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dtype: float64
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</pre>
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## --video-solution--
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2
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