Python-二分法

在数组中查找符合的数字，并返回序列号

def find(list, item):

low =0

    hith =len(list)-1

    while low <= hith:

mid =int((low + hith) /2)

if list[mid] == item:

return mid

if list[mid] < item:

low = mid +1

        else:

hith = hith -1

    return None

list = [1,2,3,4,5,6,7,8,9]

item =7

print(find(list, item))