python输出unicode编码_Python以utf8编码读取文件

with open(self.path, 'r') as test:
     for line in test:
         pass

UnicodeDecodeError: 'gbk' codec can't decode byte 0x80 in position 9: ...

UnicodeDecodeError: 'gbk' codec can't decode byte 0xb3 in position 9: illegal multibyte sequence

 with open(self.path, 'rb') as test:
     for line in test:
         pass

TypeError: a bytes-like object is required, not 'str'

 with open(self.path, 'r', encoding='utf-8') as test:
     for line in test:
         pass

 with open(self.path, 'r', encoding='utf-8-sig') as test:
     for line in test:
         pass