977 B
977 B
id | title | challengeType | videoId |
---|---|---|---|
5e9a093a74c4063ca6f7c15e | Data Cleaning with DataFrames | 11 | sTMN_pdI6S0 |
--description--
Instead of using notebooks.ai like it shows in the video, you can use Google Colab instead.
More resources:
--question--
--text--
What will the following code print out?
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--
0 1.0
1 1.0
2 2.0
3 3.0
4 3.0
dtype: float64
0 NaN
1 1.0
2 2.0
3 2.0
4 3.0
dtype: float64
0 NaN
1 1.0
2 2.0
3 NaN
4 3.0
dtype: float64
--video-solution--
2