yaml.constructor.ConstructorError: could not determine a constructor for the tag ‘tag:yaml.org,2

报错：

yaml.constructor.ConstructorError: could not determine a constructor for the tag 'tag:yaml.org,2002:python/object:argparse.Namespace'

原因：
使用os.path.join时遇到的报错
源代码：

config = yaml.safe_load(file_data)

修改为：

config = yaml.unsafe_load(file_data)