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---
id: 5e9a093a74c4063ca6f7c15e
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title: Pulizia dati con DataFrames
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challengeType: 11
videoId: sTMN_pdI6S0
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bilibiliIds:
aid: 505597026
bvid: BV1Yg411c7bx
cid: 409018948
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dashedName: data-cleaning-with-dataframes
---
# --description--
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*Invece di usare notebooks.ai come mostrato nel video, puoi usare Google Colab.*
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Altre risorse:
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- [Notebook su GitHub ](https://github.com/ine-rmotr-curriculum/data-cleaning-rmotr-freecodecamp )
- [Come aprire Notebooks da GitHub usando Google Colab. ](https://colab.research.google.com/github/googlecolab/colabtools/blob/master/notebooks/colab-github-demo.ipynb )
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# --question--
## --text--
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Cosa verrà visualizzato nella console con il seguente codice?
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```py
import pandas as pd
import numpy as np
s = pd.Series([np.nan, 1, 2, np.nan, 3])
s = s.fillna(method='ffill')
print(s)
```
## --answers--
< pre >
0 1.0
1 1.0
2 2.0
3 3.0
4 3.0
dtype: float64
< / pre >
---
< pre >
0 NaN
1 1.0
2 2.0
3 2.0
4 3.0
dtype: float64
< / pre >
---
< pre >
0 NaN
1 1.0
2 2.0
3 NaN
4 3.0
dtype: float64
< / pre >
## --video-solution--
2