菲纳斯在熊猫

Question

The code below is executing correctly:

data['Native Country'].fillna(data['Native Country'].mode()**[0]**, inplace=True)

Can anyone explain what [0] indicates?

Answer 1

mode() method returns Series/DataFrame.

Check https://pandas.py.....as.Series.mode.html#pandas.Series.mode for Series & https://panda......i/pandas.DataFrame.mode.html for DataFrame.

In your case, it returns Series object (as you are performing it on Series) even if there is a single value in Series.

Using [0] means we want to access the first value/item in the Series for replacement of null values.

Have a look at http://www.datasciencemadesimple.com/mode-function-python-pandas-dataframe-row-column-wise-mode/ .

This might help you a lot.