Python修改写入yaml文件后排版混乱，原注释丢失问题

官方文档地址：https://yaml.readthedocs.io/en/latest/example.html

不再使用yaml库，安装pip install ruamel.yaml

示例代码如下：

from ruamel.yaml import YAML

yaml = YAML()
with open("userinfo.yaml", "r", encoding='utf-8') as f:
  data = yaml.load(f)
data['phone'] = '138xxxxxxxx'

with open("userinfo.yaml", "w", encoding="utf-8") as f:
    yaml.dump(data, f)