with open("input.txt") as f:
for line in f:
print(line)
按行读取文本文件时报错：UnicodeDecodeError: 'gbk' codec can't decode byte 0xad in position...
python的open方法默认编码取决于平台，如果是windows平台，默认编码是gbk，如果文件是utf8编码，就会报这个错误。
解决办法：
with open("input.txt",encoding='utf-8') as f:
for line in f:
print(line)
