Pandas How to question

Hi there,

I want to select all the rows in my data frame where 'finished_processing_date' is not null.

I know I can do something like this to count the null fields

df_not_finished_processing = df[df['finished_processing_date'].isnull()];
df_not_finished_processing.count()

but what about doing the opposite? Selecting all rows that the field is not null.

Comment From: TomAugspurger

.notnull or use ~ on the mask you have to flip it.

FYI: the pandas tag on stackoverflow is the preferred forum for asking usage questions.

Comment From: ghost

exactly what I was looking for.