python编码问题：UnicodeDecodeError: 'gbk' codec can't decode byte 0xaf in position 68: illeg

import yaml
def test_yaml():
f = open('C:\hogwarts\Scripts\hogwarts-api\demo\yaml_data.yml')
print(yaml.load(f))　　

# 改进：import yaml
def test_yaml():
f = open('C:\hogwarts\Scripts\hogwarts-api\demo\yaml_data.yml','rb')
print(yaml.load(f))