Sum of All Odd Length Subarrays

class Solution:
    def sumOddLengthSubarrays(self, arr: List[int]) -> int:
        # Record the sum of all subarrays
        total_sum = 0
​
        # Loop through possible subarray lengths
        for subarray_len in range(1, len(arr) + 1):
            # Skip even-length subarrays
            if subarray_len % 2 == 0:
                continue
​
            # Define start and end indexes for starting subarray
            start_index = 0
            end_index = start_index + subarray_len
​
            # While we haven't reached end of array, sum values in subarray and shift subarray by 1 index
            while end_index <= len(arr):
                total_sum += sum(arr[start_index:end_index])
                start_index += 1
                end_index += 1
​
        # Return total sum
        return total_sum