使用索引填充pandas数据帧中的平均值

Question

Trying to populate the mean values in a dataframe having NaN values. Need to populate the dataframe only for certain rows and not all rows.

Sample Data set

   A    b     c    
0 100   52    555
1 25   144    552
2 NaN  555    555
3 323  NaN    785
4 515  551    125
5 741  471    Nan
6 111  Nan    Nan

Here I need to fill values only for rows numbered 5 and 6 with the mean of their respective columns and should ignore rows 3 and 4.

Answer 1

您可以在数据帧切片上使用fillna()函数

df.iloc[5:7].fillna(mean, inplace=True)