按行读取txt文本

#!/usr/bin/python

import csv
NewSN = ""
#read last line  head data
with open('SFPrintLabel.txt',"r") as file:
    file_content = file.readlines() #把全文档读取为一个表，每一行为一个元素
    file_line_last01 = file_content[0] #读取第一行字符串内容
    file_line_last = file_content[-1] #读取最后一行字符串内容
    target = file_line_last[:12]  #截取前12个字符并存入变量target
    print(target)
    print(file_content)
    print(file_line_last01)
    print(file_line_last)

file.close()