<s> class ColumnSelector ( object ) : <EOL> """<STR_LIT>""" <EOL> def __init__ ( self , cols ) : <EOL> self . cols = cols <EOL> def transform ( self , X , y = None ) : <EOL> return X [ : , self . cols ] <EOL> def fit ( self , X , y = None ) : <EOL> return self </s>
