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id, title, challengeType, videoId, bilibiliIds, dashedName
| id | title | challengeType | videoId | bilibiliIds | dashedName | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 5e9a093a74c4063ca6f7c15d | Data Cleaning Introduction | 11 | ovYNhnltVxY |
|
data-cleaning-introduction |
--description--
Instead of using notebooks.ai like it shows in the video, you can use Google Colab instead.
More resources:
--questions--
--text--
What will the following code print out?
import pandas as pd
import numpy as np
s = pd.Series(['a', 3, np.nan, 1, np.nan])
print(s.notnull().sum())
--answers--
3
0 True 1 True 2 False 3 True 4 False dtype: bool
0 False 1 False 2 True 3 False 4 True dtype: bool
--video-solution--
1