old_contents: import yaml
  
  
  class ReportLoader(object):
      _header_keys = (
          'probe_asn',
          'probe_cc',
          'probe_ip',
          'start_time',
          'test_name',
          'test_version',
          'options',
          'input_hashes',
          'software_name',
          'software_version'
      )
  
      def __init__(self, report_filename):
          self._fp = open(report_filename)
          self._yfp = yaml.safe_load_all(self._fp)
  
          self.header = self._yfp.next()
  
      def __iter__(self):
          return self
  
      def next(self):
          try:
              self._yfp.next()
          except StopIteration:
              self.close()
              raise StopIteration
  
      def close(self):
          self._fp.close()
  
new_contents: import yaml
  
  
  class ReportLoader(object):
      _header_keys = (
          'probe_asn',
          'probe_cc',
          'probe_ip',
          'start_time',
          'test_name',
          'test_version',
          'options',
          'input_hashes',
          'software_name',
          'software_version'
      )
  
      def __init__(self, report_filename):
          self._fp = open(report_filename)
          self._yfp = yaml.safe_load_all(self._fp)
  
          self.header = self._yfp.next()
  
      def __iter__(self):
          return self
  
      def next(self):
          try:
              return self._yfp.next()
          except StopIteration:
              self.close()
              raise StopIteration
  
      def close(self):
          self._fp.close()
  
subject: fix serialisation of reports