拉出CSV文件中的最小值

I am trying to pull out all the relevant info for the lines with the minimum value in a csv file with Python. Below is my code to find out the relevant information. The minimum value is 12 when I code it spaerately. But when I put in the function and will process the minimum to find and record other data in the csv file.The value can not be updated. What I am missing to update the value of line[9]?I am trying to pull out all the relevant info f