python | 读文件编码问题 | UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 34: illegal mu

UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 34: illegal multibyte sequence
后面处理数据时没有转码下,如open函数上 
 处理如下
with open("data.txt",'r',encoding='UTF-8') as data: