Addition, deletion, modification and query of ymal file

yaml Introduce ：
A data format , Support comments , Line break , Multiline string

Way of use ：
Generally, it can be used as a configuration file （conf file ） Record account information , Environmental Science , database , Interface related parameters, etc

Usage method ：
1、 Read yaml file

import yaml
  """ Read configuration file """
    with open(read_path() + "/conf/config.yaml") as f:
        data = yaml.safe_load(f)
    return data

2、 modify yaml Data in the file

  with open(read_path() + "/conf/config.yaml", 'w') as f:
         yaml.dump(data, f, default_flow_style=False)

3、 newly added yaml Data in the file

       with open(read_path() + "/conf/config.yaml", "a") as f:
            yaml.dump(desired_caps, f)