[Python] Apply a function to 2 columns in Polars [duplicate]

I want to apply a custom function which takes 2 columns and outputs a value based on those (row-based)

In Pandas there is a syntax to apply a function based on values in multiple columns

df['col_3'] = df.apply(lambda x: func(x.col_1, x.col_2), axis=1)


What is the syntax for this in Polars?

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