Subarray with Given Sum

The following question was asked during a coding interview for Amazon:

You are given an array of numbers (non-negative). Find a continuous subarray of the list which adds up to a given sum.

alt

# Solve the problem here
def sum_array(array,sum1):
    for i in range(len(array)):
        for j in range(i,len(array)+1):
            if sum(array[i:j]) == sum1:
                return i,j
            
    return None,None

# Test the solution here
list1 = [1,7,4,2,1,3,11,5]
ls2 = sum_array(list1,10)

ls2

(2, 6)