Binary Search

binary_search.py

def binary_search(list, item):
    low = 0
    high = len(list) - 1

    while (low <= high):
        mid = int((low + high) / 2)
        guess = list[mid]
        if guess == item:
            return mid
        if guess > item:
            high = mid - 1
        elif guess < item:
            low = mid + 1

    return None


my_list = [1, 3, 5, 7, 9]

print(binary_search(my_list, 9))
print(binary_search(my_list, 576))