devops-exercises/coding/python/binary_search.py

#!/usr/bin/env python

import random

rand_num_li = sorted([random.randint(1, 50) for _ in range(10)])
target = random.randint(1, 50)


def binary_search(arr, lb, ub, target):
    if lb <= ub:
        mid = ub + lb // 2
        if arr[mid] == target:
            return mid
        elif arr[mid] < target:
            return binary_search(arr, mid + 1, ub, target)
        else:
            return binary_search(arr, lb, mid - 1, target)
    else:
        return -1


print("List: {}\nTarget: {}\nIndex: {}".format(
    rand_num_li, target,
    binary_search(rand_num_li, 0, len(rand_num_li) - 1, target)))