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实例如下所示:
>>> import pandas as pd >>> import numpy as np >>> ts1 = [0, 1, np.nan, np.nan, np.nan, np.nan] >>> ts2 = [0, 2, np.nan, 3, np.nan, np.nan] >>> d = {'X': ts1, 'Y': ts2, 'Z': ts2} >>> df = pd.DataFrame(data=d) >>> df X Y Z 0 0.0 0.0 0.0 1 1.0 2.0 2.0 2 NaN NaN NaN 3 NaN 3.0 3.0 4 NaN NaN NaN 5 NaN NaN NaN >>> col =['X','Y'] >>> df[col] = df[col].ffill() >>> df X Y Z 0 0.0 0.0 0.0 1 1.0 2.0 2.0 2 1.0 2.0 NaN 3 1.0 3.0 3.0 4 1.0 3.0 NaN 5 1.0 3.0 NaN >>>
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