Why is the array not visible in the method?

Question

Python

I created a class, defined the postsMas array in it and created the save() method below. Further in this method, I wanted to refer to the array, but for some reason unknown to me, the postsMas array is not visible in the save() method. Although I define an array above the method. Please explain why?

Here is the code:

class Post():
title = '1'
pubDate = '2'
time = '3'

postsMas = [
    [title, pubDate, time]
]

SAVES_FILE = 'saves.dat'

def save(self):
    SAVES_FILE = 'saves.dat'
    with open(SAVES_FILE, 'ab') as file:
        pickle.dump(postsMas, file)

Error: NameError: name 'postsMas' is not defined

Answer 1

self.postsMas