my_search.py

import random

alist = []
for i in range(1, 101):
    alist.append(i)
n = random.choice(alist)
# 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置

def bs(alist,n):
    l = 0
    h = len(alist)-1
    while l <= h:
        m = (l+h) // 2
        g = alist[m]
        if g == n:
            return m
        elif g < n:
            l = m +1
        else:
            h = m -1
    return None
     

r = bs(alist,n)
print("数字：",n)
print("索引是：",r)