How to count the amount of times a certain word appears in my python output? (Multiple Lines/Long List)

Question

so I am doing some sentiment analysis on a bunch of reviews (100,000 reviews which I data cleaned down to 9,000). I successfully analyzed each review into Positive and Negative. Now when I print my results, it prints each of the reviews and says "Positive" or "Negative". Here is a simplified results of my output https://i.imgur.com/y0iALSg.jpg

Now I want to count the amount of times "Positive" appears and amount of times "Negative" appears. I tried a bunch of different ways but the furthest I've gotten is to count only the first line of my output.

Here's one of the ways I've tried:

x = sentimentprediction.count('Positive')

print(x)

Any thoughts on how to do this?