pandas copy data from a column to another

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Logan
28 Oct 2020
1df = pd.DataFrame()
2
3df['X'] = [0, 3, 1, 1, 2, 2, 3, 3, 1, 2]
4df['Y'] = [111.0, np.nan, np.nan, 112, 113, np.nan, 114, 115, np.nan, 116]
5
6df['Y'] = df['Y'].fillna(df['X'])
7
8print(df)
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