How to update list value in dictionary in Python

Question

Beginner here. I'm currently writing a program that will turn every word in a "movie reviews" text file into a key, storing a list value containing the review number and the number of times the word has been seen. For example:

4 I loved it

1 I hated it

... might look like this as a dictionary:

words['i']     = [5,2]

words['loved'] = [4,1]

words['it']    = [5,2]

words['hated'] = [1,1]

However, this is the output I've been getting:

{'i': [1, 2], 'loved': [4, 1], 'it': [1, 2], 'hated': [1, 1]}

I figured out the counter part, but I can't figure out how to update the review number. Here is my code so far:

def main():

    reviews = open("testing.txt", "r")
    data = reviews.read();
    reviews.close()

    # create new dictionary
    words = {}

    # iterate over every review in text file
    splitlines = data.split("\n")

    for line in splitlines:
        lower = line.lower()
        value = lower.split()
        rev = int(value[0])
        for word in value:
            if word.isalpha():
                count = 1
                if word not in words:
                    words[word] = [rev, count]
                else:
                    words[word] = [rev, count + 1]

How can I update the review number count?

Answer 1

This is pretty easy to do. Assuming each key has only 2 items in the value list:

if word not in words:
    words[word] = [rev, 1]
else:
    temp = words[word][1]
    words[word] = [rev, temp + 1]

Answer 2

When updating the count, you're using count + 1 , but count will always be 1 here; you need to retrieve the existing count first, using something like: count = words[word][1]