python读取ANSI文本乱码问题

文本文件是ANSI保存，以ISO-8859-1保存，Python读取报错:

UnicodeDecodeError: 'utf-8' codec can't decode byte 0xd1 in position 272: invalid continuation byte

修改方式如下：

with open('newFile.txt', 'r', encoding='ISO-8859-1') as fp:
    for line in fp.readlines():
        line = line.encode("iso-8859-1").decode('gbk')
        print(line)

line为什么不直接decode?因为Python3.6的str没有decode，必须先encode后，才能decode