What is the function of this Python code snippet?

$x=df[x_c$olumns$].$ values

Part of One$-$Hot Encoding$-$It gets dummy values for the column 'heart' in the DataFrame df

It creates a list of column names, X $\_$columns, for creating $Y-$values.

It creates a list of column names, $x\_$columns, without the name $\text{'}$ diagnosis $`$ for creating $x-$values.

It creates a feature vector called $x$ which is a Numpy array of the independent variables.