流式读取文件
GO 利用bufio包（流式操作） - 并发写文件/读文件示例_bufio.newwriter_dreamer'~的博客-CSDN博客 https://blog.csdn.net/qq_37102984/article/details/123009654
fn = "D:\\迅雷下载\\export_0.csv"
m,id_lst=1000,[]
with open(fn, 'r', encoding='utf-8') as fr:
while not fr._finalizing and m:
line = fr.readline()
print(line)
lst=line.split("\t\t\t")
id_lst.append(lst[1])
m-=1
