What is fillna? Meaning and example

What is fillna?

fillna: A pandas method that replaces missing values with a value you choose, such as zero, the column mean, or the previous value. It is a basic way to impute gaps, but the choice of replacement changes later statistics, so it should suit the data.

fillna: an example

df['age'].fillna(df['age'].median()) fills blank ages with the median age.

Related terms

dropna
Missing data
NaN
Imputation

More NumPy pandas visualization terms

Heatmap
Histogram
iloc
KDE plot
Legend
Line plot
loc
Log scale

Where you learn it

fillna is part of the AI Engineering Program, which teaches it with notes, a hands-on lab and an exam. The first lesson is free.