code: def to_yaml(value, pretty=False):
      
  
      if not yaml:
          raise NotImplementedError('No supported YAML library available')
  
      options = {
          'Dumper': BasicYamlDumper,
          'allow_unicode': True,
      }
      options['default_flow_style'] = not pretty
  
      return yaml.dump(value, **options).rstrip()
docs: Serializes the given value to YAML.
  
      :param value: the value to serialize
      :param pretty:
          whether or not to format the output in a more human-readable way; if
          not specified, defaults to ``False``
      :type pretty: bool
      :rtype: str