python 处理文本文件行级数据提取，写入目标文件

1 首先把源文件读取，循环匹配，匹配到的行做进一步处理，写入目标文件，并换行。

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import warnings
warnings.filterwarnings("ignore")

def main():
    with open("form.txt", 'rb') as f:
        try:
            lines = f.read().splitlines()
            lines = [line.decode('utf-8-sig') for line in lines]
        except UnicodeDecodeError:
            sys.exit()
        # 打开一个文件
        fo = open("to.txt", "w")
        
        for line in lines:
            info = line.split(' ')
            if len(info) > 0 and info[0].isdigit():
                user_config = {}
                user_config['user_id'] = info[0]
                if len(info) == 1:
                    fo.write(info[0])
                    fo.write("\n")
                else :
                    if len(info) >1:
                        if info[1]=="regstr":
                            fo.write(info[0])
                            fo.write("\n")
        # 关闭打开的文件
        fo.close()
if __name__ == '__main__':
    main()