/Python/Pandas copy data from a column to another

Pandas copy data from a column to another

df = pd.DataFrame()

df['X'] = [0, 3, 1, 1, 2, 2, 3, 3, 1, 2]
df['Y'] = [111.0, np.nan, np.nan, 112, 113, np.nan, 114, 115, np.nan, 116]

df['Y'] = df['Y'].fillna(df['X'])

print(df)

Source: stackoverflow.com

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