fillna inplace code example

Example 1: pandas replace nan

data["Gender"].fillna("No Gender", inplace = True)

Example 2: how to replace nan values with 0 in pandas

df.fillna(0)

Example 3: fillna pandas inplace

When inplace = True , the data is modified in place, which means it will return nothing and the dataframe is now updated. When inplace = False , which is the default, then the operation is performed and it returns a copy of the object. You then need to save it to something.