List name of columns with numeric values, it didn't work

I wanted a list of columns with numeric values I tried the code in the image but it didn’t work, anybody knows why? is there another way to do it? thankyou

>Solution :

.select_dtypes() gives you a filtered out dataset with only numeric columns and with .columns you get a list of the columns like this:

employee_df.select_dtypes(include=['int', 'float']).columns