Why isn't the first code not working, whereas second does?

Question

First code snippet:

imp.fit_transform(dataset['Age'].values.reshape(-1,1))

dataset['Age'] = dataset['Age'].values.reshape(-1,1)

Second code snippet:

imp.fit(dataset['Age'].values.reshape(-1, 1))

dataset['Age'] = imp.transform(dataset['Age'].values.reshape(-1, 1))

The first code snippet does not make any change to the age column of my dataset.

Answer 1

The correct implementation of the first piece of code would be :

dataset['Age'] = imp.fit_transform(dataset['Age'].values.reshape(-1,1))

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