import yaml

class HandleYaml:
  def __init__(self, filename=None):
    if filename is None:
      self.filename = 'testcase.yaml'
    else:
      self.filename = filename
    with open(filename, encoding="utf-8") as file: # 用上下文管理器打开yaml配置文件
      self.data = yaml.full_load(file) # 加载yaml文件，返回一个嵌套字典的字典

  def get_data(self, section, option):
    return self.data[section][option]

if __name__ == "__main__":
  s = HandleYaml()
  s.get_data('excel', 'filename')