Python 测试开发算法面试题

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二分查找算法：

#coding=utf-8

def binary_search(num_list,x):
    '''二分查找'''
    num_list=sorted(num_list)
    left,right = 0,len(num_list)
    while left <right:
        mid = int((left + right)/2) #获取中间的值得index
        if num_list[mid] > x:
            right = mid
        elif num_list[mid] < x:
            left = mid+1
        else:
            return '待查元素{0}在列表中下标位:{1}'.format(x,mid)
    return '待查找元素%s不存在指定列表中'%x


if __name__ =='__main__':
    num_list = [11,22,34,78,33,3,6,192,21,45,66]
    print(binary_search(num_list,33))

mid 的值必须强制转化为int 型 不然会报错！！报错信息如下
TypeError: list indices must be integers or slices, not float