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def binary_search (sort_list,item) :    length = len(sort_list)    low = 0;    high = length -1             while low<=high :        mid = (high-low) // 2        current_item = sort_list[mid]        if current_item == item:            return item        if current_item < item :            high = mid-1        if current_item > item :            low =  mid+1    return none        if __name__ == '__main__' :     sort_list = [1,3,5,9,18,21,30,44,62]    user_input = int(input("请输入查找的数字:\n"))    result = binary_search(sort_list,user_input)    print(result)

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