pandas对指定列进行填充

>>> 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
>>> 
    原文作者:GeekLeee
    原文地址: https://blog.csdn.net/GeekLeee/article/details/75271233
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