LeetCode 1281 Subtract the Product and Sum of Digits of an Integer.py

1. What I learned

a. def subtractProductAndSum(self, n: int) -> int:
b. how to use class
c. how to declare a list
d. difference in the runtime   

2. Code

class Solution:
    def subtractProductAndSum(self, n: int) -> int:
        lenOfNum = len(str(n))
        arr = [None] * lenOfNum

        i=0
        product = 1
        sum = 0
        for _ in range(0,lenOfNum):
            arr[i] = int(n%10)
            n = n/10
            product *= arr[i]
            sum += arr[i]
            i = i+1

        return product-sum

Check out the my GitHub repo for more info on the code. If you have questions, you can leave a reply on this post.