Issue checking for missing datetime value in series

Question

I\'m trying to create a derived column based on two conditions being met for values in existing columns. One of the conditions that needs to be met is that that value for on

Answer 1

I was running into a similar problem. This worked for me:

instead of using:

(sample_df['line_start_time'].isnull())

use:

(sample_df['line_start_time'] is pd.NaT)

hopefully that at least gets rid of your current error.