binary search using iteration

bsearch_iter.py

# 반복문
def binary_search_iter(seq, target):
    high , low=len(seq),0
    while low < high:
        mid = (high+low)//2
        if target ==seq[mid]:
            return mid
        elif target<seq[mid]:
            high=mid
        else:
            low=mid+1
    return None